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3.7X3.7+3.7X7.3%3.7巧算怎么做

3.7X3.7+3.7X7.3-3.7 =3.7×(3.7+7.3-1) =3.7×10 =37

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

原式 =76×(73+27) =73×100 =7300

=(2×5)×(7×7×13)÷(7×7×13) =2×5×1 =10

巧算下面这道题: 2.015x7.3+20.15x0.37-2.015 =2.015x7.3+2.015x3.7-2.015 =2.015x(7.3+3.7-1) =2.015x10 =20.15

50x7x2 =50x2x7 =100×7 =700

原式=8.1×(13.7-1)+7.3×7.1 =8.1×12.7+7.3×(8.1-1) =8.1×12.7+7.3×8.1-7.3 =8.1×(12.7+7.3)-7.3 =8.1×20-7.3 =162-7.3 =154.7

3十4十5十6+7+8十9 =(3+9)X(9-3+1)÷2 =12X7÷2 =6X7 =42

3.58x7.4+35.8x0.36-3.58 =3.58x7.4+3.58x3.6-3.58 =3.58×(7.4+3.6-1) =3.58×10 =35.8

=0.36×7.4+0.36×2×1.3 =0.36×7.4+0.36×2.6 =0.36×(7.4+2.6) =0.36×10 =3.6

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