Question

简便运算！急急急！

(3/5)/((3/5)+(9/25)) 求过程

Answer 1

(3/5)/((3/5)+(9/25))
=(3/5)/[(3/5)×(1+3/5]
=1/(1+3/5)
=1/(8/5)
=5/8

追问

加法！！！！=(3/5)/[(3/5)×(1+3/5]怎么是*？

追答

3/5+9/25
=3/5+3/5×3/5
=3/5×(1+3/5)

Answer 2

(3/5)/((3/5)+(9/25))
=（3/5）/【（3/5）+（3/5）*（3/5）】
=（3/5）/【（3/5）*（1+（3/5）】
=（3/5）/【（3/5）*（8/5）】
=（3/5）*（5/3）*（5/8）
=5/8

Answer 3

此题利用倒数的办法 a/b=1÷（b/a）

(3/5)/((3/5)+(9/25)
=1÷{ [(3/5) + (9/25) ] ÷（3/5）}
=1÷{ 1+ （3/5 ） }
=1÷（8/5）
=5/8

Answer 4

(3/5)/((3/5)+(9/25))
=(3/5)/((15/25)+(9/25))
=(15/25)/(24/25)
=15/24
=5/8