Hoặc
Tính:
a) 4x2+2x−2.3x+2x−4.4−2x2x2+1;
a, 4x2+2x−2.3x+2x−4.4−2x2x2+1
=22x2+1.3x+2.22−xx−2.x−4.2x2+1
=2.3x+2.2.−1x−2x−2.x−4
=23x+2.2.−1x−4=−43x+2x−4