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不能用分數表達的數,沒有道理——無理數 不是代數方程根的數,不簡單啊——超越數 不能在數軸上表達的數,有點虛幻——虛數
原式=2的兩千零二次方+(-2)的兩千零二次方*2 =二+負二的兩千零二次方*2 =0
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