Решите СИСТЕМУ УРАВНЕНИЙ1) 2х+5у=1-х+2у 14х-5=9х-3у-2 (1/2 (одна вторая) х) 2) 1/2...

1)
$\left \{ {{2x+5y=1-x+2y} \atop {14x-5=9x-3y-2}} \right. \\ \left \{ {{2x+x=-5y+1+2y} \atop {14x-9x=5-3y-2}} \right. \\ \left \{ {{3x+3y=1} \atop {5x+3y=3}} \right. \\ \left \{ {{-3x-3y=-1} \atop {5x+3y=3}} \right. \\ \left \{ {{x=1} \atop {y=- \frac{2}{3} }} \right. \\ 2) \\ 0,5= \frac{1}{2} \\ \left \{ {{0,5x+3y=1,5} \atop {0,5x-2y=4}} \right. \\ \left \{ {{-0,5x-3y=-1,5} \atop {0,5x-2y=4}} \right. \\ \left \{ {{y=-0,5} \atop {x=6}} \right.$