x2+ax-bx-by+xy-ab 因式分解.急.!

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x2+ax-bx-by+xy-ab 因式分解.急.!

x2+ax-bx-by+xy-ab 因式分解.急.!
x2+ax-bx-by+xy-ab 因式分解.急.!

x2+ax-bx-by+xy-ab 因式分解.急.!
x²+ax-bx-by+xy-ab
=x(x+y)+a(x-b)-b(x+y)
=(x-b)(x+y)+a(x-b)
=(x-b)(x+y+a)

x2+ax-bx-by+xy-ab
=x(x-b)+a(x-b)+y(x-b)
=(x-b)(x+a+y)

(1)2ax-10ay 5by-bx =(2a-b)x -5(2a-b)y =(2a-b)(x-5y) (2)x xy bx ax by ay =x(x y) (a b)(x y) =(x