Question

Решите пожалуйсто 60 балов !!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

1.
а) -2xy²(2y-3x+x²) = -2xy³+6x²y²-2x³y²
б) 3xy(2x-3x²+4xy)·(-2y²) = (6x²y-9x³y+12x²y²)·(-2y²) = -12x²y³+18x³y³-24x²y^4

2.
4(x²-3x+2)-2(2x²-5x+1) = 4x²-12x+8-4x²+10x-2 = 6-2x
x = -3
6-2x = 6-2*(-3) = 6+6 = 12

3.
2xy(x-y)-3x²(x+y²) = 2x²y-2xy²-3x³-3x²y²
Степень 4.