A^4b^4-a^2b^4 a^3b^2+a^5b^3 -x^5y^3-x^3y^5

A) 5a-2b-4a-3b+2a = 3a-5b
в) x^3-x-6x^2+6-x^3 = -6x^2-x+6
b) 3x^2-6x-5x^2-15x = -2x^2-21x
2) 30y-6-27y+12 =3y+6 
При y = -4 :
2) 3*(-4) +6 = -6
При y=3:
2) 3*3+6 = 15

a)25a^2-10ab+b^2
г) 0,6х+х^2-0.36-0,6x = x^2-0.36
д)4x^2+12x+9-2x^2-5x+6x+15 =2x^2+13x+24
б) y^2+12y+36
в)25a^2+10a-10a-4 = 25a^2-4

a^4b²-a²b^4=a²b²(a²-b²)

a³b²+a^5b³=a³b²(1+a²b)

-x^5y³-x³y^5=-x³y³(x²+y²)