October 2018 1 41 Report

Ile rozwiązań mają poniższe układy? (proszę o rozwiązanie ukladów)

\left \{ {{5x-10y=15} \atop {-2x+4y=-6}} \right.

\left \{ {{\frac{1}{2}x+\frac{1}{3}y=1} \atop {-6x-4y=-10}} \right.

\left \{ {{2x+y=5} \atop {2y-x=5}} \right.


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