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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

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

14.4/1.2+3.2×7=144/12+(3×7+0.2×7)=12+(21+1.4)=12+22.4=34.4 采纳哦!谢谢!

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

=(2×5)×(7×7×13)÷(7×7×13) =2×5×1 =10

7.25×97 =7.25×(4×24+1) =7.25×4×24+7.25×1 =29×24+7.25 =696+7.25 =703.25 7.25×7.25×97+7.25×2 =7.25×(7.25×97+2) =7.25×(703.25+2) =7.25×705.25 =5113.0625

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