<PRE><B>Question 761870</B>
1. 5/r7

2. (-4r5)(-2r3)

3. a/r10+r2

4. (-5r6)(2r3)

5. r16/36
---------------
Do you have a question?
---
Use ^ (Shift 6) for exponents, eg, 2r^3
</PRE>