m^2+n^2=1,x^2+y^2=9 mx+ny的最大值为
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m^2+n^2=1,x^2+y^2=9 mx+ny的最大值为
m^2+n^2=1,x^2+y^2=9 mx+ny的最大值为
m^2+n^2=1,x^2+y^2=9 mx+ny的最大值为
直接利用均值不等式就可以求得:
因为mx
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