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1.2x9.9x2.5=简便计算

2.5*4*0.3*9.9=10*9.9*0.3=99*0.3=29.7

你好: 23x0.1+2.3x9.9 =2.3x1+2.3x99 =2.3x(99+1) =2.3X100 =230 如果满意记得采纳! 求好评! (*^__^*) 嘻嘻……

(3.6×7.5×9.5)÷(1.2×2.5×1.9) =(3.6÷1.2)×(7.5÷2.5)×(9.5÷1.9) =3×3×5 =45

7.5x2.3+1.9x2.5+12.5x0.4 =2.5x3x2.3+1.9x2.5+2.5x5x0.4 =2.5x(6.9+1.9+2) =2.5x10.8 =2.5x(10+0.8) =2.5x10+2.5x0.8 =25+2 =27

6.9x7.1+2.9x2.5用简便方法计算 答案: 6.9x7.1+2.9x2.5=6.9x7+6.9x0.1+2.9x2+2.9x0.5 =48.3+0.69+5.8+1.45 =56.24

2.85×9.9+0.01×28.5 =2.85×(9.9+0.1) =2.85×10 =28.5 你好,本题已解答,如果满意 请点右上角“采纳答案”。

7.2x0.2+2.4x1.2 =2.4×3×0.2+2.4×1.2 =2.4×(0.6+1.2) =2.4×2-2.4×0.2 =4.8-0.48=4.32 2.22x9.9+6.66x6.7 =6.66×3.3+6.66×6.7 =6.66×(3.3+6.7) =66.6

1.2x8.9-7.9 =10.68-7.9 =2.78

原式 =2.5x7.9x1.2 =2.5x7.9x(4x0.3) =(2.5x4)x(7.9x0.3) =10x2.37 =23.7 供参考。

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