已知m^2+n^2+2m-6n+10=0,则m+n等于?(m^2+2m+1)+(n^2-6n+9)=0,为什么10变成了9?
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![已知m^2+n^2+2m-6n+10=0,则m+n等于?(m^2+2m+1)+(n^2-6n+9)=0,为什么10变成了9?](/uploads/image/z/216814-22-4.jpg?t=%E5%B7%B2%E7%9F%A5m%5E2%2Bn%5E2%2B2m-6n%2B10%3D0%2C%E5%88%99m%2Bn%E7%AD%89%E4%BA%8E%3F%28m%5E2%2B2m%2B1%29%2B%28n%5E2-6n%2B9%29%3D0%2C%E4%B8%BA%E4%BB%80%E4%B9%8810%E5%8F%98%E6%88%90%E4%BA%869%3F)
已知m^2+n^2+2m-6n+10=0,则m+n等于?(m^2+2m+1)+(n^2-6n+9)=0,为什么10变成了9?
已知m^2+n^2+2m-6n+10=0,则m+n等于?(m^2+2m+1)+(n^2-6n+9)=0,为什么10变成了9?
已知m^2+n^2+2m-6n+10=0,则m+n等于?(m^2+2m+1)+(n^2-6n+9)=0,为什么10变成了9?
m^2+n^2+2m-6n+10=0
(m^2+2m+1)+(n^2-6n+9)=0
(m+1)^2+(n-3)^2=0
m=-1 n=3
m+n=2
为什么10变成9了呢?
因为是把10拆成了1+9,前面m^2+2m+1 ,后面n^2-6n+9
以后做题目要细心一点.
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