Toán Lớp 7: tính x,y ,z:
6/11.x=9/2.y=18/5.z và -x+z=196
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Toán Lớp 7: tính x,y ,z:
6/11.x=9/2.y=18/5.z và -x+z=196
Comments ( 1 )
\dfrac{6}{{11}}x = \dfrac{9}{2}y = \dfrac{{18}}{5}z\\
\Leftrightarrow \dfrac{{6x}}{{11.18}} = \dfrac{{9y}}{{2.18}} = \dfrac{{18z}}{{5.18}}\\
\Leftrightarrow \dfrac{x}{{33}} = \dfrac{y}{4} = \dfrac{z}{5} = \dfrac{{ – x + z}}{{ – 33 + 5}} = \dfrac{{196}}{{ – 28}} = – 7\\
\Leftrightarrow \left\{ \begin{array}{l}
x = – 7.33 = – 231\\
y = – 7.4 = – 28\\
z = – 7.5 = – 35
\end{array} \right.\\
Vay\,x = – 231;x = – 28;z = – 35
\end{array}$