Cách giải đề 95x+27y=7,4 119x+135,5y=43,5

Đáp án:

$\left\{\begin{array}{l} x=-\dfrac{1718}{96595}\\y=\dfrac{32519}{96595}\end{array} \right.$

Giải thích các bước giải:

$\left\{\begin{array}{l} 95x+27y=7,4\\ 119x+135,5y=43,5\end{array} \right.\\ \Leftrightarrow \left\{\begin{array}{l} 119(95x+27y)=119.7,4\\ 95(119x+135,5y)=95.43,5\end{array} \right.\\ \Leftrightarrow \left\{\begin{array}{l} 11305x+3213y=880,6\\11305x+12872,5y=4132,5\end{array} \right.\\ \Leftrightarrow \left\{\begin{array}{l} 11305x+3213y=880,6\\11305x+12872,5y-(11305x+3213y)=4132,5-880,6\end{array} \right.\\ \Leftrightarrow \left\{\begin{array}{l} 11305x+3213y=880,6\\9659,5y=3251,9\end{array} \right.\\ \Leftrightarrow \left\{\begin{array}{l} x=-\dfrac{1718}{96595}\\y=\dfrac{32519}{96595}\end{array} \right.$