Hoặc
Tính:
b) x+3x.x+2x2+6x+9:x2−4x2+3x.
b, x+3x.x+2x2+6x+9:x2−4x2+3x
=x+3.x+2x.x+32.x2+3xx2−4
=x+2.xx+3x.x+3x+2x−2
=1x−2