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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

详细步骤写在纸上了

九分之八-(1-八分之一)用简便方法计算 =8/9十1/8一1 =64/72十9/72一1 =73/72一1 =1/72

答案是8。 1.简便运算如下: 8/9*10-8/9=8/9*(10-1)=8/9*9=8。 2.运算定律与简便运算: 本题用的是乘法分配律,乘法分配律的概念为两个数的和,乘以一个数,可以拆开来算,积不变。 字母公式:(a+b)×c=a×c+b×c 例题:(2+3)×10 =3×10+2×10 =30+20 =50

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

9/10×34.5+111×1.8+54.3÷1又9分之1 =0.9×34.5+111×2×0.9+54.3÷9分之10 =0.9×34.5+222×0.9+54.3×0.9 =(34.5+222+54.3)×0.9 =310.8×(1-0.1) =310.8-31.08 =279.72

3又9分之8 加 4又18分之5 减 2又9分之八 (用简便方法计算) =(3又8/9-2又8/9)+ 4又5/18 =1+ 4又5/18 =5又5/18 (5又18分之5) 3分之2等于6分之5加( -6分之1)等于( 12分之17)减4分之3 2/3-5/6=-1/6 2/3+3/4=17/12 3、从大到小排列1、0.41 0....

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

12乘4分之9乘57分之8乘3分之2 =(12×4分之9×3分之2)×57分之8 =18×57分之8 =6×19分之8 =19分之49

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