phan tich cac da thuc sau thanh nhan tu
a) a^2c-a^2d-b^2d+b^2c
b)8x^2+4xy-2ax-ay
c) x^2-y^2-2yz-z^2
d) 3a^2-6ab+3b^2-12c^2
e)x^2-2xy+y^2-m^2+2mn-n^2
g) a^2-10a+25-y^2-4yz-4z^2
h) x^2-2x-3
i) a^4+5a^3+15a-9
k) bc ( b+c)+ac (c-a)-ab (a+b)
l) 4x-4y+x^2-2xy+y^2
Loga
Sinh Học lớp 12
