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1的倒數平方立方絕對值都等於它本身的數 0的相反數平方立方絕對值都等於它本身, 相反數倒數平方立方絕對值都等於它本身的數沒有
(a+2)的平方+b-3的絕對值等於0, a+2=0,b-3=0 a=-2,b=3 不清
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