(3y-4)(y+1)=y(3y+1)
3y²-4y+3y-4=3y²+y
-y-4=y
-y-y=4
-2y=4
y=-2
79^2 = 6241
49^2=2401
(12 1/2)^2=6^2=36
X^2 - 3x / 8 = 0 | * 8
x^2 - 3x = 0
x(x - 3) = 0
x = 0 или x - 3 = 0, x = 3
Ответ: 0; 3
-1.5<-5t+1≤2
-2.5<-5t≤1
-1≤5t<2.5
-0.2≤t<0.5
Ответ:t∈[-0.2;0.5)