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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

1.2x8.9-7.9 =1.2x(7.9+1)-7.9 =(1.2-1)x7.9+1.2 =1.58+1.2 =2.78

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”。

1x9+2x9+......+9x9 =(1+2+3+4+5+6+7+8+9)X9 =45X9 =405

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

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