Tính

Tính
1, (x+2)2 + 2(x+1)
2, (x-3)(x+3) - (x-1)(x2-3)
3,(x-4)2 +(x+1)(x+2)
4, (2-x)(2y-5) -(2x-y)2
5,(x-y)2 +2x(x+y)
6,3x(x+1)(x-1) - (2x-3)2
7 3(x+1)+(x+1)2