(n-3)^(n+3) = (n-3)^(2n) n是正整数若n=1,等式左边=(-2)^4=16,等式右边=(-2)^2=4,等式不成立；若n=2,等式左边=(-1)^5=-1,等式右边=(-1)^4=1,等式不成立；若n=3,等式左边=0^6=0,等式右边=0^6=0,等式成立；若n=4,等式...