(3x-2/1y)^2-(3x+2/1)^2用平方公式计算
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(3x-2/1y)^2-(3x+2/1)^2用平方公式计算
(3x-2/1y)^2-(3x+2/1)^2用平方公式计算
(3x-2/1y)^2-(3x+2/1)^2用平方公式计算
(3x-2/1y +3x+2/1)(3x-2/1y-3x-2/1)
=(6x -y/2 +1/2)(-y/2 -1/2)
自己搞定就好了,
(3x-2/1y)^2-(3x+2/1)^2
=(3x-y/2+3x+1/2)(3x-y/2-3x-1/2)
=(6x-y/2+1/2)(-y/2-1/2)
=-(6x-y/2+1/2)(y/2+1/2)
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