(x y)²-(a b)² x²-6x 9-y² 分解因式
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(xy)²-(ab)²x²-6x9-y²分解因式(xy)²-(ab)²x²-6x9-y²分解因式(xy)²-(
(x y)²-(a b)² x²-6x 9-y² 分解因式
(x y)²-(a b)² x²-6x 9-y² 分解因式
(x y)²-(a b)² x²-6x 9-y² 分解因式
(x+y)²-(a+b)²
=(x+y+a+b)(a+y-a-b)
(x-y)²-(a-b)²
=(x-y+a-b)(x-y-a+b)
(xy)²-(ab)²
=(xy+ab)(xy-ab)
x²-6x+9-y²
=(x-3)²-y²
=(x-3+y)(x-3-y)