m²+2m+n²-6n+10=0 则m*n等于?
人气:317 ℃ 时间:2020-04-15 03:24:55
解答
∵m²+2m+n²-6n+10=0
∴(m²+2m+1)+(n²-6n+9)=0
∴(m+1)²+(n-3)²=0
∴m+1=0,且n-3=0
∴m=-1,n=3
∴m×n=-1×3=-3
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