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2.8x1.5%1.2的简便计算怎么写

=2.8×1.5-0.8×1.5 =(2.8-0.8)×1.5 =2×1.5 =3

1.5×1.2 =1.5(1+0.2) =1.5×1+1.5×0.2 =1.5+0.3 =1.8

解:采用分配律, 原式=(1.08+2.5)x1.5 =2.58x(1+0.5) =2.58x1+2.58x0.5 =2.58+1.29 =9.87

简便运算 2.45x1.2÷2.8 =(2.45÷0.7)×(1.2÷4) =3.5×0.3 =1.05

1、=(2x5)^4x2=200003、=8^8x(1/8)^8=14、=(3x2/3)^5x5^6=(2x5)^5x5=500000

2.04

原式 =(1.5+1.2)×5.5 =2.7×5.5 =(3-0.3)×5.5 =16.5-1.65 =14.85

=0.25×4×0.3—0.25×4×0.7 =0.3—0.7 =—0.4

原式=5.6x2.9+5.6x6.1+5.6 =5.6x(2.9+6.1+1) =5.6x10 =56

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