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三点2×8点4×5 1得几除以一点6×0点7×0点三的积的简...

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你的方法对的。第一步那里有点错误。 应该是。7.6x5

5.6-5点6×0点7的积除以22点四简便运算 5.6-5点6×0点7的积除以22点四 =5.6-5.6*0.7÷22.4 =5.6-3.72÷22.4 =5.6-0.1660714286

三点6×0点2+7点4×0点二四-0点二四的简便运算 3.6*0.24+7.4*0.24-0.24 =0.24*(3.6+7.4-1) =0.24*10 =2.4

解: 1/[n(n+1)(n+2)(n+3)(n+4)] =¼×[(n+4)-n]/[n(n+1)(n+2)(n+3)(n+4)] =¼×{ 1/[n(n+1)(n+2)(n+3)] -1/[(n+1)(n+2)(n+3)(n+4)]} 1/(1×2×3×4×5)+ 1/(2×3×4×5×6)+1/(3×4×5×6×7)+ 1/(4×5×6×7×8) =¼×[1/(1×2×3×4)- 1/(2×3×4×5)+ 1/...

3.2×0.5÷3.2×0.7 =(3.2÷3.2)×(0.5×0.7) =1*0.35 =0.35

原式=0.7×0.2×0.14 =0.14×0.14 =0.0196

7.3÷4+2.7×0.25 =7.3×0.25+2.7×0.25 =0.25×(7.3+2.7) =0.25×10 =2.5

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