分式计算!先化简 再求值.
问题描述:
分式计算!先化简 再求值.
{3a/(a-1)-2/(a+1)*(a^2-1)/a 其中a=根号3
答
=3a/(a-1)-2/(a+1)*(a-1)(a+1)/a
=3a/(a-1)-2a/(a-1)
=a/(a-1)
=根号3(根号3+1)/2