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4.5×1.2%2.8×1.2简便算法.谢谢

4.2+2.8x1.2简便计算 =4.2+2.8+2.8x0.2 =7+0.56 =7.56

1.2×2.8×1.2÷2.8 =(1.2×1.2)×(2.8÷2.8) =1.44×1 =1.44

7.2+2.8×5-1.2 =7.2+14-1.2 =21.2-1.2 =20

4.05–2.8–1.2的简便运算 解: 4.05–2.8–1.2 =4.05-(2.8+1.2) =4.05-4 =0.05

1.2+1.8+1.4+2.6+3-(1.6+2.4+2+2.8) =3+4+3-(4+2+2.8) =10-8.8 =1.2

(1)1.2×2.5+2.8×2.5,=(1.2+2.8)×2.5,=4×2.5,=10;(2)4.8×2.5,=(4×1.2)×2.5,=(4×2.5)×1.2,=10×1.2,=12.

4.5x2.8一0.15X0.8 =12.6-0.12 =12.48 没有合适的简便方法

能简算要用简便方法计算4.2十2.8X1.2 解:采用分配律, 原式=4.2+2.8x(1+0.2) =4.2+2.8+2.8x0.2 =7+5.6 =12.6

5.6×2.4÷2.8÷1.2=5.6×2.4×1/2.8×1/1.2=5.6×1/2.8×2.4×1/1.2=2×2=4

1.5x-2.8 +1.1=2.2 1.5x=2.2+2.8 -1.1 1.5x=3.9 x=2.6

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