Đặt a/b=c/d=k
=>a=bk; c=dk
\(\dfrac{c}{a+c}=\dfrac{dk}{bk+dk}=\dfrac{d}{b+d}\)
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Đặt a/b=c/d=k
=>a=bk; c=dk
\(\dfrac{c}{a+c}=\dfrac{dk}{bk+dk}=\dfrac{d}{b+d}\)