Tính: (x + 2)^2; (2x + 3)^2 - (x + 1)^2

1 Tính
a,(x+2)^2
b,(2x+3)^2-(x+1)^2
c,(2x+3y)^2
d,(2x+y^2)^3
e,(x-3)(x^2+3x+9)
f,25+10x+x^2
g,9/25x^4-1/4

2. Tìm x
a,(x-3)^2-4=0
b,(x+4)^2-(x+1)(x-1)=16
c,3(x-1)^2-3x(x-5)=1

3. Làm tính nhân
a,(x^2y^2-xy+2y)(x-2y)
b,(x^2-xy+y^2)(x+y)
c,(x-y)(x^2+xy+y^2)
d, x^2(x^2+x+1)
e,3x^3y-1/2x^2+1/5xy
f,1/2[(5x+3)+(3x+y)]2y
g,x^3(5x^2-x-1/3)