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1/(x-2)+1/(x+2)+2x/(x平方+4)+4x三次方/(x四次方+16)

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1/(x-2)+1/(x+2)+2x/(x平方+4)+4x三次方/(x四次方+16)
如题
=(x+2+x-2)/(x平方-4)+2x/(x平方+4)+4x三次方/(x四次方+16)
=2x/(x平方-4)+2x/(x平方+4)+4x三次方/(x四次方+16)
=(2x三次方+8x+2x三次方-8x)/(x四次方-16)+4x三次方/(x四次方+16)
=4x三次方/(x四次方-16)+4x三次方/(x四次方+16)
=(4x五次方+16*4x三次方+4x五次方-16*4x三次方)/(x八次方-256)
=8x五次方/(x八次方-256)