请问1+t*(2t⼀1-t^2)怎么等于(1+t^2)⼀(1-t^2)

2024-12-03 16:14:48
推荐回答(1个)
回答1:

1+t×[2t/(1-t²)]
=1+2t²/(1-t²)
=(1-t²)/(1-t²)+2t²/(1-t²)
=(1-t²+2t²)/(1-t²)
=(1+t²)/(1-t²)