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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

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

18.6 解: 6.1×2.9+0.1×9.1 =(6+0.1)×2.9+0.91 =17.4+(0.29+0.91) =17.4+1.2 =18.6

=12×19.8-9.8×12=12×(19.8-9.8=120)

4.8X9.9+1.2X0.4 =4.8X9.9+4.8X0.1 =4.8X(9.9+0.1) =4.8X10 =48 不懂可追问,有帮助请采纳,谢谢!

9.9²+9.9X0.2+0.01=9.9²+2X9.9X0.1+0.1²=(9.9+0.1)²=10²=100就是完全平方式的应用,a²+2ab+b²=(a+b)²

(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

1、0.4x(2.5-0.25)+2.9 =2.5*0.4-0.4*0.25+2.9 =1-0.1+2.9 =3.9-0.1 =3.8 2、1.25-1.25x0.8 =1.25*(1-0.8) =1.25*0.2 =0.25 3、11.25+11.25x0.8 =11.25*2-11.25*0.2 =22.5-2.25 =20.25 4、(0.25+2.5+25)x0.8 =(0.25+2.5+25)-(0.25+2.5+25...

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