Выражение-1)(a-1)²-a(a+2) 2)a(a--4)² 3)(c-3)²-c(c-2) 4)x(x-+x)²

1)(a-1)²-a(a+2)=a²-2a+1-a²-2a=-4a+1

2)a(a-2)-(a-4)²=a²-2a-(a²-8a+16)=a²-2a-a²+8a-16=6a-16

3)(c-3)²-c(c-2)=c²-6c+9-c²+2c=-4c+9

4)x(x-4)-(3+x)²=x²-4x-(9+6x+x²)=x²-4x-9-6x-x²=-10x-9