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一道数学题,简便方法计算

1/1x2=1-1/2 1/2x3=1/2-1/3 . . . 1/1x2+1/2x3+1/3x4+...+1/10x11 =1-1/2+1/2-1/3+1/3-1/4...-1/11= 1-1/11=10/11

1.4²×9-2.3²×36=(1.4×3)²-(2.3×6)² =4.2²-13.8² =(4.2+13.8)(4.2-13.8) =18×(-9.6) =-172.8

原式 =35x(20+2) =35x20+35x2 =700+70 =770 供参考。

5.6×2.9 3.77×1.8 0.02×96 5.22×0.3 9.99×0.02 5×2.44 1.666×6.1 9.432×0.00 5.6×6.5 4.88×2.9 5.61×4.3 8.9×2.4 5.5×55 9.77×0.02 1.384×5.1 8.78×83 2.6×6 0.059×0.2 4.268×1.7 57×5.7 9.46×2.85 17.8×6.4 1.5×4.9 2.5×0.88 5.555×5.2 2.22×3....

=1/2[(1-1/3)+(1/2-1/4)+(1/3-1/5)+......+(1/17-1/19)+(1/18-1/20) =1/2[1+1/2-1/3+1/3-1/4+1/4-......-1/18+1/18-1/19-1/20] =1/2(1+1/2-1/19-1/20) =(1/2)*(531/380) =531/760

把题目放在百度上,五年级上册最难的题目太过笼统,你也可以将题目拍成图片上传

2006的平方-4010乘2006+2005的平方 =2006(2006-4010)+2005^2 =2006(-2004)+2005^2 =2005^2-(2005+1)(2005-1) =2005^2-(2005^2-1^2) =1

3.6✖️31.4+43.9✖️6.4 的简便算法 一道小学数学题。 3.6✖️31.4+43.9✖️6.4 的 =113.04+280.96 =394 直接计算 美语计算

5/1x6/1+6/1x7/1+7/1x8/1+8/1x9/1+9/1x10/1 =5X6+6X7+7X8+8X9+9X10 =6X12+7X8+9X18 =6X(12+27)+7X8 =6X39+7X8 =234+56 =290

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