(1/X-1)-(3/X3-1)=?请问知道算这个题目

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(1/X-1)-(3/X3-1)=?请问知道算这个题目
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(1/X-1)-(3/X3-1)=?请问知道算这个题目
(1/X-1)-(3/X3-1)=?请问知道算这个题目

(1/X-1)-(3/X3-1)=?请问知道算这个题目
(1/X-1)-(3/X3-1)
=1/(x-1)-3/(x-1)(x²+x+1)
=(x²+x+1)/(x-1)(x²+x+1)-3/(x-1)(x²+x+1)
=(x²+x-2))/(x-1)(x²+x+1)
=(x+2)(x-1)/(x-1)(x²+x+1)
=(x+2)/(x²+x+1)

[1/(x-1)]-[3/(x^3-1)]
=[/(x-1)]-[3/(x-1)(x^2+x+1)]
=[(x^2+x+1)/(x-1)(x^2+x+1)]-[3/(x-1)(X^2+x+1)
=(x^2+x+1-3)/[(x-1)(x^2+x+1)]
=(x^2+x-2)/[(x-1)(x^2+x+1)]
=(x+2)(x-1)/[(x-1)(x^2+x+1)]
=(X+2)/(x^2+x+1).