toán lớp 8 : phân tích đa thức thành nhân tử

P

pinkylun

â) $ 2xy+3z+6y+xz$

$=2y(x+3)+z(x+3)=(x+3)(2y+z)$ :D

b. $5x^2+5xy-x-y=(x+y)(5x-1)$

c) $ 2x^2-2xy-7x+7y=(x-y)(2x-7)$

d) $x^2-3x+xy-3y=(x-3)(x+y)$

2. a) $x^2-10x+25=(x-5)^2$

b) $=(x-8)(x+8)$

c)$=(5x+5y-4x+4y)(5x+5y+4x-4y)=(x+9y)(9x+y)$

d) $=(x^2-1)(x^2+1)=(x-1)(x+1)(x^2+1)$

 
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