[1+2x-4分号(x+1)(x-2)]÷x+3分号x^2 -1要过程,急_数学解答

[1+2x-4分号(x+1)(x-2)]÷x+3分号x^2 -1
要过程,急

人气：409 ℃　时间：2019-09-06 09:03:15

解答

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