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用简便方法计算2.8×9分之8+1点2×9分之8%9分之8怎么算

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。

2.8×9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

详细步骤写在纸上了

8/15÷2/9÷4/5 =8/15×9/2×5/4 =8/15×5/4×9/2 =2/3×9/2 =3 (7/8+3/4)÷1/4 =7/8÷1/4+3/4÷1/4 =7/2+3 =13/2 =6.5 8/13÷7+1/7×6/13 =8/13×1/7+1/7×6/13 =(8/13+6/13)×1/7 =14/13×1/7 =2/13

15.7 - ( 5.7 - 2.8 ) = 15.7 - 5.7 + 2.8 = 12.8 4/9 - 7/16 * 4/9 = 4/9 * 1 - 7/16 * 4/9 = 4/9 * (1 - 7/16) = 4/9 * 9/16 = 1/4 (3/4 - 5/7 )/ (1/56) =( 3/4 / 1/56 ) - ( 5/7 /1/56 ) = 42 - 40 = 2 望采纳

排版错误,无法回答。

=(2.5x4)x9x(12.5x8) =10x9x100 =9000 1/2÷[1-(3/9+5/9)] =1/2÷1/9 =9/2 =4.5

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