(2x^1/2+3y-1/4)(2x^1/2-3y-1/4)怎么算用平方和公式,
问题描述:
(2x^1/2+3y-1/4)(2x^1/2-3y-1/4)怎么算
用平方和公式,
答
(2x^1/2+3y-1/4)(2x^1/2-3y-1/4)
=[2x^(1/2)]² -[3y^(-1/4)]²
=4x - 9y^(-1/2)