通分a/a^2+2a+1,2/3a+6

问题描述:

通分a/a^2+2a+1,2/3a+6

a/a^2+2a+1
=a/(a+1)²
=3a(a+2)/3(a+1)²(a+2)
2/3a+6
=2/3(a+2)
=2(a+1)²/3(a+1)²(a+2)