Упростите выражение:
1. 4c(c-2)-(c-4)²
2. 3a(a+2)-(a+3)²
3. 3(y-1)²+6y
4. 8c+4(1-c)²
5. 4ab+2(a-b)²

1. 4c(c-2)-(c-2)(c+2)=(c-2)(4c-c-2)=(c-2)(3c-2)2. 3a(a+2)-(a+3)^2=3a^2+6a-a^2-6a-9=2a^2-93. 3(y^2-2y+1)+6y=3y^2-6y+3+6y=3(y^2+1)4. 8c+4-8c+4c^2=4(1+c^2)5. 4ab+2a^2-4ab+2b^2=2(a^2+b^2)