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(3x+2)²=16 兩邊開平方得: 3x+2=±4 x=2/3 或者 x=-2 1/2(2x-1)³=-4 兩邊同時除以1/2 (2x-1)³=-8 兩邊同時開立方得: 2x-1=-2 x=-1/2
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