<span> y=15x+90
y=0
15x+90=0
x=-6
x=0
y=90</span>
5x^2-7x=0
x(5x-7)=0
x=0
5x-7=0
5x=7
x=1,4
5х-3 2х+5
_____ + ______=-3| ×6
2 3
3(5х-3)+2(2х+5)=-18
15х-9+4х+10+18=0
19х+19=0
19(х+1)=0
19=0 или х+1=0
х=-1
Ответ:-1
<span>x²-12x+45=(x-15)(x+3)
</span>x²-12x+45=<span>x²-15x+3x-45
</span>x²-12x+45=<span>x²-12x-45
</span>
Неверно