1/(x-1)-1/(x+1) -2/(x²+1)-4/(x的4次方+1)-8/(x的8次方+1)-16/(x的16次方+1)
=(x+1)/(x ²- )-(x-1) /(x²-1) -2/(x²+1)-4/(x的4次方+1)-8/(x的8次方+1)-16/(x的16次方+1)
=2/(x²-1) -2/(x²+1)-4/(x的4次方+1)-8/(x的8次方+1)-16/(x的16次方+1)
=4/(x的4次方-1)-4/(x的4次方+1)-8/(x的8次方+1)-16/(x的16次方+1)
=8/(x的8次方-1)-8/(x的8次方+1)-16/(x的16次方+1)
=16/(x的16次方-1)-16/(x的16次方+1)
=32/(x的32次方-1)
两个合并后,再和第三个合并