In four years Xiao Hong 's age plus Xiao Li's age will be 39

灰尘迎面我呸2022-10-04 11:39:542条回答

In four years Xiao Hong 's age plus Xiao Li's age will be 39.Five years ago ,xiao Hong was 9 years old .How old is Xiao Li now

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枪毙那共回答了10个问题 | 采纳率70%: 小红今年14岁小李17岁; 1年前

丝丝sunny 共回答了83个问题 | 采纳率: 4年后小红的年龄加上小李的年龄是39，5年前，小红9岁。现在小李几岁？
39-（9+4）-4=22; 1年前

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都很简单的题目
1.Ben has four more than twice as many CDs as Jack .If they have a total of 31 CDs ,how many CDs does Jack have
Ben 的CD是Jack的2倍还多4张,如果他们一共有31张CD,那问Jack有几张CD?
x+2x+4=31 ===> x = 9
2.Jack wants to replace the flooring in his rectangular Kitchen .He calculates the area of the floor to be 12.8 square meters ,The actual area of the floor is 13.5 square meters .What is the relative error in calculating the area of the floor ,to the nearest thousandth?
Jack想重新装修一下他家厨房的地板,他算了一下他家的地板面积是12.8平米,可实际上正确答案是13.5平米.Jack测量的相对误差是多少,答案精确到千分之一.
(13.5-12.8)/13.5 = 0.051851851851851816 = 0.052
3.A right triangle contains a 38° angle whose adjacent side measures 10 centimeters.What is the length of the hypotenuse ,to the nearest hundredth of a centimeter
一个直角三角形有一个角是38度,对边是10cm,问斜边的长度.
sin (38*3.14/180) = 对边 / 斜边
====> 斜边 = 16.2427 cm
这个题如果是不准带计算器的话,有点难度,要用三角函数的近似
sin[38] = sin[30+8] = sin[30]cos[8] + sin[8]cos[30]
sin[30] = 1/2
cos[30] = sqrt(3)/2
角度比较小的时候
sin[x] = x-x^3/6,cos[x] = 1-x^2/2,x=角度*3.1416/180=0.14
带入到前面的式子中
sin[38] = ((1 - x^2/2)/2 + 1.732/2*(x - x^3/6))
10/sin[38] = 16.235 cm
4 画图我用Mathematica 一句话搞定
Plot[{Abs[x],Abs[3 x]},{x,-3,3},PlotStyle -> Thick]
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In four years Xiao Hong 's age plus Xiao Li's age will be 39

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