3(x²-y²)-1/2(xy-y)²化简
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3(x²-y²)-1/2(xy-y)²化简3(x²-y²)-1/2(xy-y)²化简3(x²-y²)-1/2(xy-y)
3(x²-y²)-1/2(xy-y)²化简
3(x²-y²)-1/2(xy-y)²化简
3(x²-y²)-1/2(xy-y)²化简
3(x²-y²)-1/2(xy-y)²
=3x²-3y²-1/2(x²y²-2xy²+y²)
=3x²-3y²-(½)x²y²+xy²-(½)y²
=3x²-(7/2)y²-(½)x²y²+xy²