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這個簡單哈:) 必要條件的範圍要大於充分條件的,用判別式Δ= 2^2-4a=4-4a 充要條件:4-4a≥0; 充分條件:4-4a>0; 必要條件:4-4a>1;(大於2,3,隨便一個什麼大於零的數都可以)
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