1.如果n为正整数,则(-1)的2n次方=______,(-1)2n次方-1=_____.(解释如何解出来的)2.若a是正数,则/a/ _____0若a是0,则/a/ _____0若a是负数,则/a/____0因此,对于任意有理数a,总有/a/ ______.(前面三空我都会,- -第四
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