(2x^1/2+3y-1/4)(2x^1/2-3y-1/4)怎么算
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(2x^1/2+3y-1/4)(2x^1/2-3y-1/4)
=[2x^(1/2)]² -[3y^(-1/4)]²
=4x - 9y^(-1/2)
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