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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

原式 =76×(73+27) =73×100 =7300

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

173x173-73x73 =(173+73)×(173-73) =246×100 =24600 平方差公式

46x72x23÷46÷23÷72 =(46÷46)x(72÷72)x(23÷23) =1x1x1 =1

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