(急!证明对于任意自然数n,3^(n+2) - 2^(n+3)+3^n-2^(n+1)一定能被10整除.(1)证明对于任意自然数n,3^(n+2) - 2^(n+3) + 3^n - 2^(n+1)一定能被10整除.(2)若a-b=2,a-c=0.5,求(b-c)^2 - 3(b-c)+9/4的值.(3)已知6
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