x-1分之1－x+1分之1﹣x²＋1分之2﹣x四次方＋1分之4
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=(x+1)/(x+1)(x-1)-(x-1) /(x+1)(x-1)-2/(x²+1)-4/(x的4次方+1)
=(x+1-x+1)//(x+1)(x-1)-2/(x²+1)-4/(x的4次方+1)
=2/(x²-1)-2/(x²+1)-4/(x的4次方+1)
=2(x²+1)/(x²+1)(x²-1)-2(x²-1)/(x²+1)(x²-1)-4/(x的4次方+1)
=4/(x²+1)(x²-1)-4/(x的4次方+1)
=8/(x的8次方-1)
=(x+1-x+1)//(x+1)(x-1)-2/(x²+1)-4/(x的4次方+1)
=2/(x²-1)-2/(x²+1)-4/(x的4次方+1)
=2(x²+1)/(x²+1)(x²-1)-2(x²-1)/(x²+1)(x²-1)-4/(x的4次方+1)
=4/(x²+1)(x²-1)-4/(x的4次方+1)
=8/(x的8次方-1)
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