计算:(2x-y-3)(2x-y+3)
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计算:(2x-y-3)(2x-y+3)计算:(2x-y-3)(2x-y+3)计算:(2x-y-3)(2x-y+3)(2x-y-3)(2x-y+3)=[(2x-y)-3][(2x-y)+3]=(2x-y
计算:(2x-y-3)(2x-y+3)
计算:(2x-y-3)(2x-y+3)
计算:(2x-y-3)(2x-y+3)
(2x-y-3)(2x-y+3)
=[(2x-y)-3][(2x-y)+3]
=(2x-y)^2-3^2
=(2x-y)^2-9
=4x^2+y^2-4xy-9
谢谢!
(2x-y-3)(2x-y+3)
=[(2x-y)-3][(2x-y)+3]
=(2x-y)^2-3^2
=4x^2-4xy+y^2-9
(2x-y)＾2-9
(2x-y-3)(2x-y+3) =(2x-y)^2-3^2 =4x^2-4xy+y^2-9
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