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2.8x1.5%1.2的简便计算怎么写

1.5x1.2 =1.5x(1+0.2) =1.5x1+1.5x0.2 =1.5+0.3 =1.8 1.5x1.2 =(1+0.5)x1.2 =1x1.2+0.5x1.2 =1.2+0.6 =1.8

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

7.2 +2.8×5-1.2 =(7.2-1.2)+(3-0.2)×5 =6+3×5-0.2×5 =6+15-1 =20

2.8X1.4+3.6X1.2 =(3-0.2)×1.4+(4-0.4)×1.2 =3X1.4-0.2X1.4+4X1.2-0.4X1.2 =4.2-0.28+4.8-0.48 =4.2+4.8-0.28-0.48 =9-0.28-0.48 =8.24

=0.25×4×0.3—0.25×4×0.7 =0.3—0.7 =—0.4

2.8十5.71x2.1用简便 2.8十5.71x2.1 =0.7x4十5.71x0.7x3 =0.7x(4十5.71x3) =0.7x(4十17.13) =0.7x21.13 =14.791

供参考

(3.6×7.5×2.4)÷(1.5×1.2×1.8) =5*3*4/3 =20

30-1.8*2.6=30-(-2*0.2)*2.6=30-(1-0.1)*5.2=30-5.2+0.52=24.8+0.52=25.32

2.8X1.4+3.6X1.2=(3-0.2)×1.4+(4-0.4)×1.2=3X1.4-0.2X1.4+4X1.2-0.4X1.2=4.2-0.28+2.8-0.48=8.24

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