求下面2道题目，能有过程的。急！谢谢！
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1. 设(x+1)/x = t, (x^2+1)/x^2 + 1/x = t^2 - 1/x = t^2 - t + 1, f(t) = t^2 - t+1, f(x) = x^2 - t+1
2. 1/x + 2 = t, x = 1/(t-2), x/(1-x) = 1/(t-3), f(t) =1/(t-3), f(x) = 1/(x-3)
2. 1/x + 2 = t, x = 1/(t-2), x/(1-x) = 1/(t-3), f(t) =1/(t-3), f(x) = 1/(x-3)
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