(1-(1/5+1/7.5)×2)÷(1/7.5)等于多少有好评.

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(1-(1/5+1/7.5)×2)÷(1/7.5)等于多少有好评.(1-(1/5+1/7.5)×2)÷(1/7.5)等于多少有好评.(1-(1/5+1/7.5)×2)÷(1/7.5)等于多少有好评.(

(1-(1/5+1/7.5)×2)÷(1/7.5)等于多少有好评.
(1-(1/5+1/7.5)×2)÷(1/7.5)等于多少有好评.

(1-(1/5+1/7.5)×2)÷(1/7.5)等于多少有好评.
(1-(1/5+1/7.5)×2)÷(1/7.5)
= (1-(3/15+2/15)×2)÷(2/15)
=(1-1/3×2)÷2/15
=(1-2/3)÷2/15
=1/3÷2/15
=1/3×15/2
=5/2

(x-1)*(3/15+2/15+3/15)=1
(x-1)*8/15=1
(x-1)=15/8
x=23/8

是七点五分之一吗?

2.5