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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

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

(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.

1.5*1.2=3/2*6/5=9/5=1.8

1.5x[1÷(2.1-2.09)] =1.5×【1÷0.01】 =1.5×100 =150

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

3.52×2.8-1.8×3.52 =3.52×(2.8-1.8) =3.52×1 =3.52

1.2x2.5+0.8x2.8 =3+2.24 =5.24

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