分解因式:
(1)25x²-y²;
=(5x)²-y²
=(5x+y)(5x-y)
(2)(a-b)(x-y)+(a-b)(x+y)
=(a-b)(x-y+x+y)
=2x(a-b)
(3)(x+2y)²-8xy
=x²+4xy+4y²-8xy
=x²-4xy+4y²
=(x-2y)²
分解因式:
(1)25x²-y²;
=(5x)²-y²
=(5x+y)(5x-y)
(2)(a-b)(x-y)+(a-b)(x+y)
=(a-b)(x-y+x+y)
=2x(a-b)
(3)(x+2y)²-8xy
=x²+4xy+4y²-8xy
=x²-4xy+4y²
=(x-2y)²