化简:5*a‘2/5ab= ,9a*b'2+6abc/3*a'2*b= ,(x+y)y/x*y'2=
问题描述：
化简:5*a‘2/5ab= ,9a*b'2+6abc/3*a'2*b= ,(x+y)y/x*y'2=
答
化简:
5a^2/5ab=a/b
9ab^2+6abc/3a^2b=9ab^2+2c/a
(x+y)y/xy^2=(x+y)/xy=1/x+1/y