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7.2一1.9+2.8 用简便方法计算

7.2+2.8-1.9=10-1.9=8.1

2.25×7又5/1+2.8÷9/4 =2.25×7.2+2.8×2.25 =2.25×(7.2+2.8) =2.25×10 =22.5

1367.12

1.1+1.2+1.3+1.4.......+2.5+2.6+2.7+2.8+2.9 =(1.1+2.9)×(29-11+1)÷2 =4×19÷2 =38

原式 =(7.6x2.8+1.4x4x1.9-2.8x1.4)÷2.5x4 =(7.6x2.8+1.4x7.6-2.8x1.4)÷2.5x4 =[7.6x(2.8+1.4)-2.8x1.4]÷2.5x4 =(7.6x4.2-2.8x1.4)÷2.5x4 =(7.6x3x1.4-2.8x1.4)÷2.5x4 =(22.8x1.4-2.8x1.4)÷2.5x4 =20x1.4÷2.5x4 =20÷2.5x1.4x4 =8x1.4x4 =11.2x4...

2.8×9分之8+1点2×9分之8-9分之8 =8/9x(2.8+1.2-1) =8/9x3 =8/3 =3分之8 朋友,请采纳正确答案,你们只提问,不采纳正确答案,回答都没有劲!!! 朋友,请【采纳答案】,您的采纳是我答题的动力,如果没有明白,请追问。谢谢。

2.8×1.9+32.5简便方法怎么算 =2.8x2-2.8x0.1+32.5 =5.6-0.28+32.5 =32.5+6-(0.4+0.28) =38.5-0.68 =38.5-1+0.32 =37.82

对的 4.2×(2.8+1.9)=4.2×2.8+1.9×4.2 , 你好,本题已解答,如果满意 请点右下角“采纳答案”。

2.8×9分之8+1点2×9分之8-9分之8 =8/9*(2.8+1.2-1) =8/9*3 =8/3

(1)1.25*6.4*7 =1.25*0.8*8*7 =1*56 =56 (2)9.9*7.8+0.78 =99*0.78+0.78 =0.78*(99+1) =78 (3)0.77/0.55 =0.11*7/0.11*5 =7/5 (4)7.5*1.02 =7.5*(1+0.02) =7.5+7.5*0.02 =7.2+0.15 =7.35 (5)3.7*2.8+12.5 =3.7*(3-0.2)+12.5 =11...

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