(㎡+n)(㎡+n-2)+1=0(㎡+n)²-2(㎡+n)+1=0(㎡+n-1)²-0㎡+n=1
设m²+n=k则k(k-2)+1=0解得k=1
令㎡+n=x,则原式可化为x(x-2)+1=0x²-2x+1=0(x-1)²=0x=1即㎡+n=1
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