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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

1.5x1.2 =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

提出1.2,原式=(4.5-2.8)*1.2 =1.7*1.2 =1.7*(1+0.2) =1.7*1+1.7*0.2 =1.7+0.34 =2.04 如果解决了你的问题,记得采纳哦 新的问题请重新提问

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

28.5×(2.8+1.2×6) =28.5×(2.8+7.2) =28.5×10 =285

原式 =4x1.2-2.8x1.2 =(4-2.8)x1.2 =1.2x1.2 =1x1.2+0.2x1.2 =1.2+0.24 =1.44

(1)1.2×2.5+2.8×2.5 =2.5×(1.2+2.8)=2.5×4=10 (2)4.8×2.5 =4×1.2×2.5=4×2.5×1.2=10×1.2=12(3)26.34-0.36-5.64=26.34-(0.36+5.64)=26.34-6=20.34

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

1.2x1.5x2.3 =(4x1.5)x(0.3x2.3) =6x0.69 =4.14

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