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7.3乘3.7减7.3加0.73乘73怎么巧算

7.3×3.7-7.3+0.73×73 =7.3×3.7-7.3+7.3×7.3 =7.3×(3.7+7.3-1) =7.3×10 =73

3.8*3.7+0.38*73-38 =38*(0.37+0.73-1) =38*(1.1-1) =38*0.1 =3.8

原式 =(7.68-7.68)+(3.2+3.2) =0+6.4 =6.4

三点 五 乘 七点 三 加 一点 二五 乘 三十 五 =3.5x7.3+12.5x3.5 =3.5x(7.3+12.5) =3.5x(20-0.2) =3.5x20-3.5x0.2 =70-0.7 =69.3

=3.7×0.15+6.3×0.15 =(3.7+6.3)x0.15 =10x0.15 =1.5

8.8×3.7+4.4×14.6-8.8巧算 =8.8x(3.7-1)+4.4x14.6 =8.8x2.7+4.4x14.6 =4.4x2x2.7+4.4x14.6 =4.4x(5.4+14.6) =4.4x20 =88

5×999+5+99×7+7+3×9+3 =(5×999+5)+(99×7+7)+(3×9+3) =5×(999+1)+(99+1)×7+3×(9+1) =5×1000+100×7+3×10 =5000+700+30 =5730

(4-0.3)÷1/8=(4-0.3)×8=32-2.4=29.6

142×7-284×3 =142×7-142×(2×3) =142×(7-6) =142×1 =142

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