计算a-1分之1-a+1分之1-a²+1分之2-a的4次方+1分之4-a的8次方+1分之1
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a-1分之1-a+1分之1-a²+1分之2-a的4次方+1分之4-a的8次方+1分之1
=1/(a-1)-1/(a+1)-2/(a^2+1)-4/(a^4+1)-1/(a^8+1)
=(a+1-a+1)/(a-1)(a+1)-2/(a^2+1)-4/(a^4+1)-1/(a^8+1)
=2/(a^2-1)-2/(a^2+1)-4/(a^4+1)-1/(a^8+1)
=2(a^2+1-a^2+1)/(a^2-1)(a^2+1)-4/(a^4+1)-1/(a^8+1)
=4/(a^4-1)-4/(a^4+1)-1/(a^8+1)
=4(a^4+1-a^4+1)/(a^4-1)(a^4+1)-1/(a^8+1)
=8/(a^8-1)-1/(a^8+1)
=(8(a^8+1)-a^8+1)/(a^8-1)(a^8+1)
=(7a^8+9)/(a^16-1)
=1/(a-1)-1/(a+1)-2/(a^2+1)-4/(a^4+1)-1/(a^8+1)
=(a+1-a+1)/(a-1)(a+1)-2/(a^2+1)-4/(a^4+1)-1/(a^8+1)
=2/(a^2-1)-2/(a^2+1)-4/(a^4+1)-1/(a^8+1)
=2(a^2+1-a^2+1)/(a^2-1)(a^2+1)-4/(a^4+1)-1/(a^8+1)
=4/(a^4-1)-4/(a^4+1)-1/(a^8+1)
=4(a^4+1-a^4+1)/(a^4-1)(a^4+1)-1/(a^8+1)
=8/(a^8-1)-1/(a^8+1)
=(8(a^8+1)-a^8+1)/(a^8-1)(a^8+1)
=(7a^8+9)/(a^16-1)
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