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剛剛手機沒電!負二的2009次方和負2的2010次方抵消了2009次方,那化簡就是負二加副二分之一,再算,負二化為分數,負二分之四,四减一得三.負二分三.你那幾個答案我就不知道了
如果n是偶數,就是-n的2次方,如果n是奇數,就是n的2次方
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