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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

(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

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……

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

1004x2.5 =(1000+4)×2.5=1000×2.5+4×2.5=2500+10=25103.2x2.5=(0.8×0.4)×2.5=0.8×(0.4×2.5)=0.8×1=0.8 80.1-9.9 =80.1-(10-0.1) =80.1-10+0.1 =70.1+0.1 =70.2 80.1x9.9 =80.1×(10-0.1) =80.1×10-80.1×0.1 =801-8.01 729.99

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

两边乘2 2x+x-1=18 3x=19 x=19/3

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”。

7.5=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

9.2X85,5.1X9.9十0.51,81.2÷39十1.8X2.1能简便就简便,不能简便,就不简便 9.2X85, =85*(10-0.8) =85*10-8.5*0.8 =782 5.1X9.9十0.51, =5.1*(99+1) =5.1*100 =510 81.2÷39十1.8X2.1 = 81.2÷39,结果不是有限小数,核实算式

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