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[(x+1)/x+1]÷[1-3x²/(1-x²)]×1/(x-1)
=(x+1+x)/x÷[(1-x²-3x²)/(1-x²)]×1/(x-1)
=(2x+1)/x×(x+1)(x-1)/(2x+1)(2x-1)×1/(x-1)
=(x+1)/x(2x-1)
=(x+1)/(2x²-1)
=(x+1+x)/x÷[(1-x²-3x²)/(1-x²)]×1/(x-1)
=(2x+1)/x×(x+1)(x-1)/(2x+1)(2x-1)×1/(x-1)
=(x+1)/x(2x-1)
=(x+1)/(2x²-1)
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