已知A=3m²-2n²+mn,B=5mn-6m²-9n²,且满足A-B+3C=0,求多项式C
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已知A=3m²-2n²+mn,B=5mn-6m²-9n²,且满足A-B+3C=0,求多项式C
已知A=3m²-2n²+mn,B=5mn-6m²-9n²,且满足A-B+3C=0,求多项式C
已知A=3m²-2n²+mn,B=5mn-6m²-9n²,且满足A-B+3C=0,求多项式C
A-B+3C=0
所以C=(B-A)/3=[(5mn-6m²-9n²)-(3m²-2n²+mn)]/3=(4mn-9m²-7n²)/3