6分之5-7分之1+5分之1简便运算?

2024-11-22 17:25:33
推荐回答(6个)
回答1:

计算过程如下:
(5/6)-(1/7)+(1/5)
=[(35-6)/42]+(1/5)
=(29/42)+(1/5)
=(29×5+42)/(42×5)
=187/210
此题没有特别简便的方法,按步骤算并通分求得最终结果。

回答2:

见图

回答3:

5/6-1/7+1/5
=5/6+1/5-1/7
=25/30+6/30-1/7
=31/30-1/7
=217/210-30/210
=177/210
=59/70

回答4:

异分母加减法应先通分再加减。
5/6-1/7+1/5
=175/210-30/210+42/210
=(175-30+42)/210
=187/210。

回答5:

5/6-1/7+1/5
=(5/6+1/5)-1/7
=31/30-1/7
=217/210-30/210
=187/210

回答6:

5/6-1/7+1/5
=5/6-(5/35-7/35)
=5/6+2/35
=175/210+12/210
=197/210