Question

Cho \(\dfrac{a}{b}=\dfrac{c}{d}\) Chứng minh rằng \(\dfrac{a+b}{a}=\dfrac{c+d}{c}\)

Help Me !!!!!!!!!!!!!!!!!!!!!

Sẽ tick cho các pạn

Answer 1

\(\dfrac{a}{b}=\dfrac{c}{d}\Rightarrow ad=bc\)

Nếu:

\(\dfrac{a+b}{a}=\dfrac{c+d}{c}\Leftrightarrow c\left(a+b\right)=a\left(c+d\right)\)

\(ac+bc=ac+ad\)

\(bc=ad\)

\(\Leftrightarrow\dfrac{a+b}{a}=\dfrac{c+d}{c}\rightarrowđpcm\)

Answer 2

Đặt \(\dfrac{a}{b}\)=\(\dfrac{c}{d}\)=k

=> a=k.b ; c=k.d

Ta có :

\(\dfrac{a+b}{a}\)=\(\dfrac{b.k+b}{b}\)=\(\dfrac{b.\left(k+1\right)}{b}\)=k+1 ( 1 )

\(\dfrac{c+d}{c}\)=\(\dfrac{d.k+d}{d}\)=\(\dfrac{d.\left(k+1\right)}{d}\)=k+1 ( 2 )

Từ (1) và (2) thì : \(\dfrac{a+b}{a}\)=\(\dfrac{c+d}{c}\)