<span>5x²+2x-3=0
</span>D= 2²<span> - 4·5·(-3) = 4 + 60 = <span>64
</span></span><span><span>x1 = (</span><span>-2 - √64)/(2*5)</span> = (-2 - 8)/10 = -10/10 = <span>-1
</span></span>x2 = (-2 + √64)/(2*5) = (-2 +8)/10 = 6/10 = 0.6
3a-b≠0
b≠3a
naprimer: 1)a=2,b=6
2)a=-1,b=-3
3)a=0, b=0
4)a=1/3, b=1
A6. 5x+4y=-22
5x-2y=-4
5x=2y-4 (/5)
2y-4+4y=-22
x=0,4y-0,8
6y=-18
y=-3
x=-2
Ответ: (-2;-3)
Решение задачи в приложении.