括号不太清楚
是这样吗
[(1-x^2)/(1+x^2)]^3 A
[(1+2x+x^2)/(1-x^2)]^2B
[-1/(1-x)^2]^2C
A/(B*C)还是(A/B)*C
A简化[(1-x)(1+x)/(1+x^2)]^3
B简化[(1+x)^2/(1-x)(1+x)]^2=[(1+x)/(1-x)]^2
C简化1/(1-x)^4
然后画个大分数线,填上分式,约分
A/(B*C)结果 (1-x)^9(1+x)/(1+x^2)^3
(A/B)*C结果 (1-x)(1+x)/(1+x^2)^3=(1-x^2)/(1+x^2)^3