УПРОСТИТЬ:
\frac{3(a-b)}{4(c+4)} : \frac{(a-b)(a+b+1)}{(c+y)(c-y-1)}
[tex]\frac{3(a-b)}{4(c+4)} : \frac{(a-b)(a+b+1)}{(c+y)(c-y-1)} [/tex]