(1/2x²+xy-1.5y²)/(x²-y²) 分子分母同时乘以2得
=(x²+2xy-3y²)/[2(x²-y²)]
=[(x+3y)(x-y)]/[2(x+y)(x-y)]
=(x+3y)/[2(x+y)]
=(x+3y)/(2x+2y)
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