十份之七公顷是多少平方米

0.5m

21/30

呵呵,笨办法,打印1：1的圆（提前等分好的）,可以两张纸粘结.

你可以先将圆五等分：
1)、设该圆中心为O点,做圆O直径AB； 2）、在此圆中再作一直径CD,使CD垂直于AB； 3）、以半径OA的中点M为圆心,以MC为半径作弧交线段AB于点N；
4）、连结NC.则线段NC即该圆的内接正五边形边长.
之后再将这五个角分别等分就可以了.

最简单的就是画条半径,每隔36°在画条半径

给你个图

4/5

不对,如果是把一个西瓜均分成十份,那么每一份才它的是十分之一.

A ★
When Christopher Columbus landed on the then unnamed Costa Rica in 1502, he saw many Indians wearing gold earrings. So he thought the land must be rich in gold. He named the place Costa Rica, which means “rich coast” in Spanish.
Though little gold was found, Costa Rica today is indeed rich with coffee and bananas. Coffee is the most important product in Costa Rica and most of it is exported (出口) to other countries like America and West Germany. Bananas are the country’s second most important export.
Costa Ricans also grow many other crops such as fruits, corn and beans for their own use. Costa Ricans love colors and their houses are painted in bright colors.
Education is very important to the Costa Ricans. Almost every village has a school and education is a must for children between seven and fourteen years of age. Boys and girls go to separate (单独的) schools. Classes begin in March and end in November. The other three months of the year are harvest time and the children have to help their parents to pick coffee beans.
56. What’s the main idea of the first paragraph?
A. How Columbus found Costa Rica.
B. How Costa Rica got its name.
C. What the Costa Ricans wore.
D. What language the Costa Ricans spoke.
57. The Costa Ricans may NOT paint their houses ______.
A. pink and red B. grey and black
C. blue and green D. yellow and orange
58. In Costa Rica, boys and girls between seven and fourteen ______.
A. must go to school
B. study in the same school
C. do not have to go to school at all
D. can choose to stop schooling at any time
59. From December to February, school children in Costa Rica ______.
A. have lessons every day
B. have their examinations
C. help their parents pick coffee beans
D. help their parents decorate their houses
60. This passage is mainly about ______.
A. Christopher Columbus B. Costa Rica
C. some products from Costa Rica
D. the education of Costa Rica
B ★
Christian Eijkman, a Dutch doctor, left the Netherlands for the island of Java. Many people on the island had a disease called beri?鄄beri. He was going there to try and find a cure.
At first, Eijkman thought some kind of germ (细菌) caused beri?鄄beri. He raised some chickens. He didn’t eat them, but made experiments on them. The local people were quite surprised at that. One day he noticed that his chickens became sick when they were fed the food most Javanese ate — refined white rice (精炼米). When he fed them with unrefined rice, also known as brown rice, they recovered. Eijkman realized that he had made an important discovery — that some things in food could prevent disease. These things were named vitamins (维生素). The Javanese were not getting enough vitamins because they had actually removed the part that contains vitamins. Later, other diseases were also found to be caused by the lack of vitamins in a person’s food.
Today many people know the importance of vitamins and they make sure they have enough vitamins from the food they eat. If they don’t, they can also take vitamin pills.
61. The underlined word “cure” in Paragragh 1 probably means ______.
A. a medical treatment B. a kind of vitamin
C. a kind of germ D. a kind of rice
62. Christian Eijkman went to the island of Java to ______.
A. spend his holiday
B. find ways to grow better crops
C. do some research about the island
D. help the Javanese with their illness
63. Why did Christian Eijkman raise some chickens?
A. To eat them.
B. To carry out his experiments.
C. To give the Javanese a surprise.
D. To make money by selling them.
64. If a person doesn’t get enough vitamins in his diet, he’d better ______.
A. eat more rice B. eat more meat
C. eat some chicken D. eat vitamin pills
65. We can learn from the passage that ______.
A. beri?鄄beri was caused by chickens
B. the Javanese didn’t like vitamins
C. Christian Eijkman’s experiment was successful
D. the Javanese’s disease was caused by a kind of germ
C ★★
America is a mobile society. Friendships between Americans can be close and real, yet disappear soon if situations change. Neither side feels hurt by this. Both may exchange Christmas greetings for a year or two, perhaps a few letters for a while — then no more. If the same two people meet again by chance, even years later, they pick up the friendship. This can be quite difficult for us Chinese to understand, because friendships between us flower more slowly but then may become lifelong feelings, extending (延伸) sometimes deeply into both families.
Americans are ready to receive us foreigners at their homes, share their holidays, and their home life. They will enjoy welcoming us and be pleased if we accept their hospitality (好客) easily.
Another difficult point for us Chinese to understand Americans is that although they include us warmly in their personal everyday lives, they don’t show their politeness to us if it requires a great deal of time. This is usually the opposite of the practice in our country where we may be generous with our time. Sometimes, we, as hosts, will appear at airports even in the middle of the night to meet a friend. We may take days off to act as guides to our foreign friends. The Americans, however, express their welcome usually at homes, but truly can not manage the time to do a great deal with a visitor outside their daily routine. They will probably expect us to get ourselves from the airport to our own hotel by bus. And they expect that we will phone them from there. Once we arrive at their homes, the welcome will be full, warm and real. We will find ourselves treated hospitably.
For the Americans, it is often considered more friendly to invite a friend to their homes than to go to restaurants, except for purely business matters. So accept their hospitality at home!
66. The writer of this passage must be ______.
A. an American B. a Chinese
C. a professor D. a student
67. Which of the following statements is TRUE according to the passage?
A. Friendships between Americans usually extend deeply into their families.
B. Friendships between Americans usually last for all their lives.
C. Americans always show their warmth even if they are very busy.
D. Americans will continue their friendships again even after a long break.
68. From the last two paragraphs we can learn that when we arrive in America to visit an American friend, we will probably be ______.
A. warmly welcomed at the airport
B. offered a ride to his home
C. treated hospitably at his home
D. treated to dinner in a restaurant
69. The underlined words “generous with our time” in Paragraph 3 probably mean ______.
A. strict with time B. serious with time
C. careful with time D. willing to spend time
70. A suitable title for this passage would probably be “______”.
A. Friendships between Chinese
B. Friendships between Americans
C. Americans’ hospitality
D. Americans’ and Chinese’s views of friendships
D ★★★
The other day I heard a few local musicians talking:
“I hate all the terrible pianos in this town. I hate that rubbish they play on the radio. They can’t even understand a bit of music.”
“I’m never playing in that club again. Too many drunks and nobody listens to us.”
But, one younger musician said, “There are a few clubs that book my band a few nights a month, and I’m trying to find other places to play. I’m also looking to book a few summer festivals this year.”
I’ve heard that you are the average of the five people whom you spend the most time with, or to put it another way, you are who your friends are.
Attitudes are important. Whether they’re positive or negative, they’re rubbing off on you. If you’re around people who complain about lack of work and about other musicians, or blame (责怪) others, and you play the role of victim (受害者), chances are you will start to as well. So it’s time to take a look at the people you call “friends”.
This is an easy exercise: Make a list of the people who you hang out with, and simply stop spending time with the negative people on your list. Set a new standard (标准) for yourself and don’t become friends with people who fall below that standard.
Keep successful people around you and your own chances for success will be much better. Ask them how they do it. Ask if they will help you get the work you’re looking for, or maybe give you some advice to help you on your career path.
71. Which of the following would be the best title for this passage?
A. A friend in need is a friend indeed
B. How to make friendship last for ever
C. You are who your friends are
D. Friends are the most important in one’s success
72. The underlined sentence “they’re rubbing off on you” in Paragraph 6 means ______.
A. they’ll push you ahead
B. they’ll influence you
C. they’ll cover your shortcomings
D. they’ll help you achieve your goal
73. The musicians’ words at the beginning are written mainly to show ______.
A. the musicians’ living conditions are quite poor
B. people have poor taste in music
C. people have different attitudes towards the same thing
D. young people have greater chances of succeeding
74. By taking the exercise mentioned in Paragraph 7, you can ______.
A. improve a lot in making more friends
B. come to the right way of making friends
C. develop a better relationship with your friends
D. arrange the time with your friends properly
75. The passage is mainly written for ______.
A. musicians
B. managers
C. negative people
D. people wanting to succeed
答案56-60 BBACB
61-65 ADBDC 66-70 BDCDD 71-75 CBCBD

你成了！?

反过来考虑：
第九天没吃前的数量 ：10/(1/2)= 20
第八天没吃前的数量 ：20/(1-1/3)= 30
第七天没吃前的数量 ：30/(1-1/4)= 40
第六天没吃前的数量 ：40/(1-1/5)= 50
第五天没吃前的数量 ：50/(1-1/6)= 60
第四天没吃前的数量 ：60/(1－1/7)= 70
第三天没吃前的数量 ：70/(1－1/8)= 80
第二天没吃前的数量 ：80/(1－1/9)= 90
第一天没吃前的数量 ：90/(1－1/10)= 100
桃树上原有( 100 )个桃子

把西瓜看成一个椭圆球.
1、延长轴方向垂直两刀,一分为四大角.
2、延短轴方向一刀,四角变八角.
3、取出任意两角拦腰截断.

quadruplication 是一式四份的意思
但是,5 6 7 8 9 10
没有专业的,我想就说 copy 5 6 7 8 9 10 of this

1 2 4 8 16 32 64 128 256 489
尽量用2的幂次

分成1,2,4,8,16,32,64,128,256,489.把这个转换成2进制就好理解了,你可以转换看一下.

B
如果平分就是十分之一,不平分大小不同的也能分成十份

以直径为一边做36度的角,再以这个角的另一边为边再做一次36度角,如此做十次,最后一个角终边于第一个角始边重合.这样就得到十个一样的扇形

很高兴回答你的问题
1-6/10=4/10=2/5【米】
答：还剩下五分之二米.

正 统计分析与统计分析报告一、统计分析的作用与意义统计分析是统计工作过程的第四个阶段(前三个阶段是统计设计、统计调查、统计整理).统计分析的任务是根据统计调研的目的和要求,运用有关的统计指标和统计特有的分...

6×10=60（元） 84-60=24（元） 10-6=4（元） 24÷4=6（个）汉堡 10-6=4（个）薯条

80%～90%

设原有苹果x千克
　　∴原有梨(x+36)千克
　　∴(1-1/5)(x+36)=(1-1/10)x
　　x=288
　　288+36=324(千克)
　答：原有苹果288千克,原有梨324千克.

设六年级有学生X人
X*3/10=23+22
X*3/10=45
X=45*10/3
X=150
六年级有学生150人

16×2÷1/10=320

1+0.1(n-1)=2+0.1[n-1-0.1(n-1)-2]=x
解得x=9

1.每两份就是5分之一；2.每三份就是5分之一.

转化成：
一个数,被8除,余2；被9除,余3；被10除,余4
这个数,加上6,就能同时被8,9,10整除
8,9,10的最小公倍数为：360
棒棒糖最少有：360-6=354个
354加上360的整数倍也都满足要求.

5+20+45+50+80+100+90+140+220+250
1+2+3+4+5+6+7+8+9+955
95+96+97+98+99+101+102+103+104+105

原来剩=1-4/5=1/5
原来=40÷(3/10-1/5)=400吨

设这个多边形的边数是 n.
所以n边形的内角和为（n-2)*180,（n+1)边形内角和为（n+1-2)*180
已知边数增加1 它的内角和加十份之一,所以（n+1)边形内角和为（n-2)*180+（n-2)*180/10
可列方程（n+1-2)*180=（n-2)*180+（n-2)*180/10,解得n=12
所以这个多边形的边数是12

先连接对角线,用两条线段,再用两条线段把这个正方形分成三等分,就完成了

三十一分之一百二十九

汉堡6份 薯条4份!

0.832