作业帮(1+0.12+0.34)*(0.12+0.34+0.56)-(1+0.12+0.34+0.56)*(0.12+0.34)用简便算法怎么算急!
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(1+0.12+0.34)*(0.12+0.34+0.56)-(1+0.12+0.34+0.56)*(0.12+0.34)用简便算法怎么算急!
(1+0.12+0.34)*(0.12+0.34+0.56)-(1+0.12+0.34+0.56)*(0.12+0.34)用简便算法怎么算急!
(1+0.12+0.34)*(0.12+0.34+0.56)-(1+0.12+0.34+0.56)*(0.12+0.34)用简便算法怎么算急!
减号前后的等式分别分拆为：
(1+0.12+0.34)*(0.12+0.34+0.56)
=(1+0.12+0.34)*(0.12+0.34)+(1+0.12+0.34)*0.56
(1+0.12+0.34+0.56)*(0.12+0.34)
=(1+0.12+0.34)*(0.12+0.34)+0.56*(0.12+0.34)
两个相减 等式简化为
(1+0.12+0.34)*0.56-0.56*(0.12+0.34)
=1*0.56+(0.12+0.34)*0.56-0.56*(0.12+0.34)
=0.56
最后得到答案 0.56
(1+a)b-a(1+b)=b+ab-a-ab=b-a
就说到这了
a+b=b+a
(a+b)+c=a+(b+c)
ab=ba
(ab)c=a(bc)
a(b+c)=ab+ac
你可能就学到这吧
这些是要记好的
用计算机算
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