已知数列{an}和{bn}满足a1=1,b1=0, 4 a n + 1 = 3 a n - b n + 4 , 4 b n + 1 = 3 b n - a n - 4 .
(1)证明:{an+bn}是等比数列,{an–bn}是等差数列;
(2)求{an}和{bn}的通项公式.
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