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-(2/5)^2=-4/25 (-2/5)^2=4/25 -2^2/5=-4/5 第一個沒有弄明白,你的次方到底加在哪裡.不是知道是加在分數上面,還是加在分子上,還是加在分母上? 如果加在分數上,就是第一種,加在分子上就是第三種.加在分母上,不大可能哦,
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