bài 1:
A=(2x-y)^2 \ (y-2x)(y+2x)
=(y-2x)^2 \(y-2x)(y+2x)
=y-2x \y+2x
B= (4x-1)(4x+1) \ (4x-1)^2
=4x+1 \ 4x-1
C=x(36-x^2) \ x(x^2+12x+36)
=x(6-x)(6+x) \ x(6+x)^2
=6-x \ 6+x
D=(2x^4+2x)+(3x^3+3) \ (x^2-x+1)(2x+3)
=2x(x^3+1)+3(x^3+1) \ (x^2-x+1)(2x+3)
=x^3+1 \ x^2-x+1
bài 2:
a) =>x^2p+3xp+9-x^2=0
<=>p+3xp+9=0
<=>p+3xp=9
<=>