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2.9%2.9×0.52脱式计算

0.52×(9.9+0.1) 0.52×10 5.2

2.5×(2.9×0.4) =2.5×0.4×2.9 =1×2.9 =2.9

2.6×1.9÷2.6×1.9 =(2.6÷2.6)×(1.9×1.9) =1×3.61 =3.61

2.9×9.9+ 0.29 =2.9x9.9+2.9x0.1 =2.9x(9.9+0.1) =2.9x10 =29 运用乘法分配律。 希望能帮到你!

2.9x9.9+0.29 =0.29×99+0.29×1 =0.29×(99+1) =0.29×100 =29

9.9×2/5 =(10-0.1)×0.4 =10×0.4-0.1×0.4 =4-0.04 =9.96

60+2×9 先乘后加 =60+18 =78

9.9X(2/5) =10X(2/5)-(1/10)X(2/5) =2X2-1/25 =4-1/25 =3又25分之24

=(2/9)*(10/3) =20/27

88*0.25*9 =(80+8)*0.25*9 =80*0.25*9+8*0.25*9 =20*9+2*9 =180+18 =198

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