Question

Cho a/b=c/d

CM: a-c/a=b-d/b

giúp mk

Answer 1

Ta có: a/b = c/d

Suy ra a-c/b-d = a/b = c/d

a-c/b-d = a/b

Suy ra a-c/a = b-d/b ( đpcm )

Bn cứ ghi ra giấy cho dễ hiểu nhé !

 

Answer 2

\(\frac{a}{b}=\frac{c}{d}=>\frac{c}{a}=\frac{d}{b}=>1-\frac{a}{b}=1-\frac{c}{a}=1-\frac{d}{b}=>\frac{a-c}{a}=\frac{b-d}{b}\)