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5.15*3.7+6.3*5.15简便算法

(5.15×3.7)+(6.3×5.15) =5.15×(3.7+6.3) =5.15×10 =51.5

(1)17.5-5.15-1.85=17.5-(5.15+1.85)=17.5-7=10.5 (2)800×0.7×0.125=0.7×(800×0.125)=0.7×100=70(3)3.54×0.14-0.14×2.54 =0.14×(3.54-2.54)=0.14×1=0.14 (4)4.1×9.9=4.1×(10-0.1)=4.1×10-4.1×0.1=41-0.41=40.59

3.56×38.5+0.7×356+5.15×35.6 =3.56×38.5+70×3.56+51.5×3.56 =3.56×(38.5+70+51.5) =3.56×160 =569.6

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