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7.2一1.9+2.8 用简便方法计算

7.9*2.8+2.8*2.1 =(7.9+2.1)*2.8 =10*2.8 =28

14.9-2.8+5.1-7.2 =(14.9+5.1)-(2.8+7.2) =20-10 =10

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

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。

采纳一下你就知道

(1.9-1.9x0.9)÷(3.8-2.8) =(1.9-1.71)÷1 =0.19÷1 =0.19

2.8X1.1+9.9X0.8 =2.8X1.1+1.1X9X0.8 =2.8X1.1+7.2X1.1 =(2.8+7.2)X1.1 =10X1.1 =11

(1)原始=1.25*8*0.8=10*0.8=8 (2)0.78*(99+1)=7.8 (3)0.7/0.5=7/5 (4)7.5+7.5*0.02=7.65 (5)(4-0.3)*(3-0.2)+12.5=22.86

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

2.8×5.1+3.9×二又五分之四加280% =2.8x(5.1+3.9+1) =2.8x10 =28

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