已知A=x²+3y²-5xy,B=2xy+2x²-y²,求:(1)3A-B (2)A-3B
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已知A=x²+3y²-5xy,B=2xy+2x²-y²,求:(1)3A-B (2)A-3B
已知A=x²+3y²-5xy,B=2xy+2x²-y²,求:(1)3A-B (2)A-3B
已知A=x²+3y²-5xy,B=2xy+2x²-y²,求:(1)3A-B (2)A-3B
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