计算,1除以(A-1)-2除以(1-A的平方)

问题描述:

计算,1除以(A-1)-2除以(1-A的平方)

1/(A-1)-2/(1-A²)
=(A+1)/(A+1)(A-1) + 2/(A+1)(A-1)
=(A+3)/(A+1)(A-1)