thu gọn

a,(x-1)^2 + (x+1)^2

b,(2x+3)^2(4x^2-9)+(2x-3)^2
c,(2x+1)^2-(2x-1)^2

thu gọn

a,(x-1)^2 + (x+1)^2

b,(2x+3)^2(4x^2-9)+(2x-3)^2
c,(2x+1)^2-(2x-1)^2
 

Thực hiện phép tính

a,(x-2)(x+3)-x(x+2)-3(2x-1)

b,(3x+1)(2x-1)-(x-4)(2x+5)

c,(3-x)(5x+2)+(3x-2)(1-x)

tìm x biết
a,(3x-2)^2-(x+3)^2=0
b,x(x-3)+(x-1)(2-x)+5x=13
c,2x(x+2)-x(x+6)+1=0