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用简便方法计算7.2 +2.8×7.2

7.2 +2.8×7.2 =7.2+3*7.2-0.2*7.2 =4*7.2-0.2*7.2 =28.8-1.44 =27.36 希望能帮到你,请采纳正确答案. 你的点赞或采纳是我继续帮助其他人的动力

7.2+2.8-1.9=10-1.9=8.1

7.2÷0.25+2.8x4 =7.2X4+2.8X4 =4X(7.2+2.8) =4X10 =40

7.2×24+15×2.8+9×2.8 =7.2x24+(15+9)x2.8 =7.2x24+24x2.8 =24x(7.2+2.8) =24x10 =240

(1)7.2×0.5+0.5×2.8,=(7.2+2.8)×0.5,=10×0.5,=5;(2)3.57×0.125×8,=3.57×(0.125×8),=3.57×1,=3.57;(3)2.8×101,=2.8×100+2.8×1,=280+2.8,=282.8;(4)3.5×98,=3.5×(100-2),=3.5×100-3.5×2,=350-7,=343.

漆.二 +二.吧×漆.二 =漆.二+三*漆.二-0.二*漆.二 =四*漆.二-0.二*漆.二 =二吧.吧-一.四四 =二漆.三陆 希望能帮到你,请采纳正确答案. 你的点赞或采纳是我继续帮助其他人的动

简便方法计算0.72*7.2 +0.72*2.8 0.72x(7.2+2.8) =0.72x10 =7.2

2.8*7.5+72*0.75 =2.8*7.5+7.2*7.5 =(2.8+7.2)*7.5 =10*7.5 =75

7.2*14.5+17*2.8 原式=7.2*15-7.2*0.5+2.8*15+2.8*2=(7.2+2.8)*15-3.6+5.6=150+2=152

39.3*7.2+26.8*2.8 =(12.5+26.8)x7.2+26.8x2.8 =12.5x7.2+26.8x7.2+26.8x2.8 =12.5x8x0.9+26.8x(7.2+2.8) =100x0.9+26.8x10 =90+268 =358

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