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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

2.5×1.9的简便计算 =2.5×(2-0.1) =2.5×2-2.5×0.1 =5-0.25 =4.75

0.1x9.9x0.2 =0.1x0.2x9.9 =0.02x(10-0.1) =0.2-0.002 =0.198

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……

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

1.2X(9.6除2.4)除4.8 简便计算 1.2×(9.6/2.4)÷4.8 =(1.2×9.6)/(2.4×4.8) =2.4/2.4 =1.

7.5=2.5×3 22.5=2.5×9 所以就变成 2.5×(3×2.3+1.9+9×0.4)=2.5×(6.9+1.9+3.6)=25×12.4=31

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”。

2.9×1.9÷2.9×1.9 =(2.9÷2.9)×(1.9×1.9) =1.9×1.9 =(2-0.1)×1.9 =2×1.9-0.1×1.9 =3.8-0.19 =3.61

=2.9×(5.137+4.633) =2.9×10 =29

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