计算(x+2y-3/2)(x-2y+3/2)
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计算(x+2y-3/2)(x-2y+3/2)
计算(x+2y-3/2)(x-2y+3/2)
计算(x+2y-3/2)(x-2y+3/2)
(x+2y-3/2)(x-2y+3/2)
=[x+(2y-3/2)][x-(2y-3/2)]
=x平方-4y平方+6y-9/4
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