Question

Giaỉ hệ phương trình giúp mình vớ

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Answer 1

cộng từng vế ta được:

\(\left\{{}\begin{matrix}\dfrac{a}{35}-\dfrac{a}{50}=3\\\dfrac{a}{35}-b=2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}\dfrac{10a-7a}{350}=3\\\dfrac{a}{35}-b=2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}3a=1050\\\dfrac{a}{35}-b=2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}a=350\\\dfrac{350}{35}-b=2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}a=350\\b=8\end{matrix}\right.\)