(a-b)/(a+b)=0.25,则a/b=

问题描述:

(a-b)/(a+b)=0.25,则a/b=

(a-b)/(a+b)=0.25,(a/b-1)/(a/b+1)=0.25=1/4,
4a/b-4=a/b+1,
3a/b=5,
a/b=5/3

(a-b)/(a+b)=0.25,
(a-b)/(a+b)=1/4
a+b=4(a-b)
a+b=4a-4b
4a-a=b+4b
3a=5b
a/b=5/3

(a-b)/(a+b)=0.25
则a-b=0.25(a+b)
则0.75a=1.25b
所以a/b=1.25/0.75
所以a/b=5/3

a-b=0.25a+0.25b
移项得
0.75a=1.25b
a=5/3b