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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

7.2*(2-0.1) (2-0.1)*2.8

37.9-2.8-7.2+2.1 =(37.9+2.1)-(2.8+7.2) =40-10 =30 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

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

1.9*(7.2+2.8)=1.9*10=19

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

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。

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”。

(x-1.7)÷9=2.8 (x-1.7)/9=2.8 x-1.7=2.8×9 x=25.2+1.7 x=26.9

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