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假設a,b均小於等於0,那麼a+b≤0 x平方-2y+1≤0且 y平方-2x+2≤0 相加得x^2-2x+1+y^2-2y+2=(x-1)^2+(y-1)^2+1≥1,這與假設衝突,所以假設不成立,換言之a,b中至少有一個大於0
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