А)<span>24х+8=15х-100
24х-15х= -100-8
9х= -108
х= -12
все лень решать
ЭЭЭХ мне бы такое)
</span>
<span>а+а*2-в-в*2=a-b+(a-b)(a+b)=(a-b)(a+b+1)</span>
X = 5 + y
(5+y)^2 + y^2 - 81 + 2y(5+y) = 0
25 + 10y + y^2 - 81 + 2y(5+y) = 0
4y^2 + 20y - 56 = 0
y^2 + 5y - 14 = 0
y1 = 7 y2 = -2
y1 = 7
x1 = 12
y2 = -2
x2 = 3