计算(3x+2y-1)(3x-2y+1)
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计算(3x+2y-1)(3x-2y+1)
计算(3x+2y-1)(3x-2y+1)
计算(3x+2y-1)(3x-2y+1)
(3x)^2-(2y-1)^2=9x^2-4y^2+4y-1
原式=(3x)^2-(2y-1)^2
=9x^2-4y^2+4y-1
9x^2-4y^2+4y-1
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