tìm a,b :2a^2 b^2/4 4=4a^2
Giải thích
Ta có M=22a−b+6bb2−4a2−42a+b:1+4a2+4b24a2−b2
=22a+b−6b−42a−b2a−b2a+b . 2a−b2a+b4a2+4b2+1
=4a+2b−6b−8a+4b4a2+4b2+1
=− 4a4a2+4b2+1
Ta có M=22a−b+6bb2−4a2−42a+b:1+4a2+4b24a2−b2
=22a+b−6b−42a−b2a−b2a+b . 2a−b2a+b4a2+4b2+1
=4a+2b−6b−8a+4b4a2+4b2+1
=− 4a4a2+4b2+1