76. 144-x^2=x^2(x+12) ОДЗ: 144-x^2>=0 -x^2>=-144 x<=12</p>
(12-x)(12+x)=x^2(x+12) x+6>=0 x>=-6
(12+x)(12-x-x^2)=0
12+x=0 -x^2-x+12=0
x1=-12 D=49=7^2 x2=4 x3=-3
63. 118-39x=64-48x+9x^2 ОДЗ: 118-39x>=0 39x<=118 x<=3,1/118</p>
9x^2-9x-54=0
x^2-x-6=0
D=25=5^5 x1=3 x2=-2