(1+0.228-0.21)*(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)*(0.

wheelchair2022-10-04 11:39:542条回答

(1+0.228-0.21)*(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)*(0.228-0.21)如何巧算?
写清巧算步骤.

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共2条回复
chouxiaozi 共回答了15个问题 | 采纳率86.7%
原式=(1+0.2007)*(0.2007+0.2003)-(1+(0.2007+0.2003))*0.2007
=(0.2007+0.2003)+0.2007*(0.2007+0.2003)-0.2007-0.2007*(0.2007+0.2003)
=0.2007+0.2003-0.2007
=0.2003
1年前
nancy8211 共回答了28个问题 | 采纳率
(1+0.228-0.21)*(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)*(0.228-0.21)
=(0.228-0.21)*(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)*(0.228-0.21)+(0.228-0.21+0.2003)
=(0.228-0.21)[(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)]+(0.228-0.21+0.2003)
=-(0.228-0.21)+(0.228-0.21+0.2003)=0.2003
1年前

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(1+0.228-0.21)×(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)×(0.
(1+0.228-0.21)×(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)×(0.228-0.21)简便解法
这是预初一的题,但是不要告诉我去用计算机去做,
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(1+0.228-0.21)×(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)×(0.228-0.21)
=(1+0.228-0.21)×(0.228-0.21)+(1+0.228-0.21)×0.2003
-(1+0.228-0.21)×(0.228-0.21)-0.2003×(0.228-0.21)
=(1+0.228-0.21)×0.2003-0.2003×(0.228-0.21)
=0.2003× 【(1+0.228-0.21)-(0.228-0.21)】
=0.2003×1
=0.2003
把0.23,0.203,0.302,0.3002,0.2003,0.32用从大到小的顺序排列
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0.32》0.302》0.3002》0.23》0.203》0.2003
(1+0.228-0.21)x(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)x(0.
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anythingelse9 共回答了15个问题 | 采纳率86.7%
设0.228-0.21为a,0.228-0.21+0.2003为b.
(1+a)x(b)-(1+b)x(a)
=b+ab-a-ab
=b-a
=0.2003
(1+0.228-0.21)×(0.228-0.21+223)-(1+0.228-0.21+0.2003)×﹙0.228
(1+0.228-0.21)×(0.228-0.21+223)-(1+0.228-0.21+0.2003)×﹙0.228-0.21)
(能巧算的就巧算)
为爱网行1年前1
vic20027384 共回答了23个问题 | 采纳率91.3%
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在分子为5的最简分数中,与0.2003最接近的分数的分母是()
shenweifu1年前1
lisai365 共回答了15个问题 | 采纳率86.7%
在分子为5的最简分数中,与0.2003最接近的分数的分母是(24)
5÷0.2003≈24.96
如果是25.不是最简分数,所以是24
(1+0.228-0.21)×(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)×(0.
(1+0.228-0.21)×(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)×(0.228-0.21)为什么这么做啊
(1+0.228-0.21)×(0.228-0.21+0.2003)-(1+0.228-0.21+0.2003)×(0.228-0.21)
=(1+0.228-0.21)×(0.228-0.21)-(1+0.228-0.21)×0.2003
=(1+0.228-0.21)×(0.228-0.21)-0.2003×(0.228-0.21)
=(1+0.228-0.21)×0.2003-0.2003×(0.228-0.21)
=0.2003× 【(1+0.228-0.21)-(0.228-0.21)】
=0.2003×1
=0.2003
我觉得这样做很奇怪,正确吗,答案应该是对的,可是没有理由啊 一有合理答案就提 会加赏
不要用方程
顺便能把这一题做出来更好了
1x2+2x3+3x4+......19x20
不要用方程,不要规律,要式子
chenpool1年前4
centriyes 共回答了21个问题 | 采纳率90.5%
是正确的.就是分解时少写一个步骤而已,它只把分解结果写出来了,两个式子都是把0.2003提出来分解就可以消除了,最后得到答案.