已知m²-mn=1,4mn-3n²=负2,则m²+3mn-3n²是多少?
3个回答
=-1,
m²-mn=1,4mn-3n²=-2左右两式分别相加有:m²-mn+4mn-3n²=1-2推出:m²+3mn-3n²=-1
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