toán 7

H

hien_vuthithanh

$\dfrac{a}{b}=\dfrac{5}{7}$ \Rightarrow a=$\dfrac{5}{7}.b$
$a^2+b^2$=4736 \Leftrightarrow $(\dfrac{5}{7}.b)^2+b^2$=4736
\Leftrightarrow $\dfrac{74}{49}.b^2$=4736 \Rightarrow [TEX]\left[\begin{b=56}\\{b = -56} [/TEX]
Từ đây rồi tìm a
 
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