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
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
A. A²c – a²d – b²d+ b²c
= (a²c-a²d) +(b²c-b²d)
= a²(c-d)+b²(c-d)
= (c-d)(a²+b²)
(Bài này k chắc nha)
B. 8x²+4xy-2ax-ay
= 4x(2x+y)-a(2x+y)
= (2x+y)(4x-a)
C. X²- y² -2yz-z²
=-(y²+2yz+z²)-x²
= x² – (y+x)²
=[x-(y+z)][x+(y+z)]
=(x-y+z)(x+y+z)
D. 3a²-6ab+3a²-12c²
=3[(a²-2ab+b²)-4c²]
=3(a-b)²-(2c)²
= 3(a-b-2c)(a-b+2c)