计算1/(1+X)+1/(1-X)+1/(1+X2)+4/(1+X4)
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计算1/(1+X)+1/(1-X)+1/(1+X2)+4/(1+X4)计算1/(1+X)+1/(1-X)+1/(1+X2)+4/(1+X4)计算1/(1+X)+1/(1-X)+1/(1+X2)+4/(
计算1/(1+X)+1/(1-X)+1/(1+X2)+4/(1+X4)
计算1/(1+X)+1/(1-X)+1/(1+X2)+4/(1+X4)
计算1/(1+X)+1/(1-X)+1/(1+X2)+4/(1+X4)
应该是:1/(1+X)+1/(1-X)+2/(1+X2)+4/(1+X4)
=[(1-x)+(1+x)]/(1+x)(1-x)+2/(1+x2)+4/(1+x4)
=2/(1-x2)+2/(1+x2)+4/(1+x4)
=2[(1+x2)+(1-x2)]/(1-x2)(1+x2)+4/(1+x4)
=4/(1-x4)+4/(1+x4)
=4[(1+x4)+(1-x4)]/(1-x4)(1+x4)
=8/(1-x8)
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