Объяснение:
в) -3x(0,6x-12)=0
-3x=0 0,6x-12=0
x1=0 0,6x=12
x2=20
г) (5-2t)(7+5t)=0
5-2t=0 7+5t=0
2t=5 5t=-7
t1=2,5 t2=-1,4
д) (y-3)(y+4)(3y-5)=0
y-3=0 y+4=0 3y-5=0
y1=3 y2=-4 3y=5
y3=1 2/3
e) 5z(z+1)(3z-17)=0
5z=0 z+1=0 3z-17=0
z1=0 z2=-1 3z=17
z3=5 2/3
ж) t^4=0
t=0
з) (3x+2)^2=0
3x+2=0
3x=-2
x=-2/3
и) x^2(x-3)(x+6)=0
x^2=0 x-3=0 x+6=0
x1=0 x2=3 x3=-6
к) y^3(y-1)^2(y+1)=0
y^3=0 (y-1)^2=0 y+1=0
y1=0 y-1=0 y3=-1
y2=1
2) (-9x² +у³)×y= -9х²у+y⁴; у⁴ /у =у³
3) (1,4x -0,2х²)×3x=4,2х² - 0,6x³; -0,6x³/3х = -0,2х²
4) - 5ху³* ((-8/5)х² -x²y⁵ + 5y⁶)=8x³y³+5x³y⁸ -25ху⁹ 5x³y⁸/ -x²y⁵ =-5ху³