通分1/a^2+a与a/(a+1)^2

问题描述:

通分1/a^2+a与a/(a+1)^2

1/(a^2+a) = 1/a(a+1) = (a+1)/[a×(a+1)^2]
a/(a+1)^2 = a^2/[a×(a+1)^2]