When 1/10 percent of 5000 is subtracted from 1/10 of 5000 the difference is
1. 0
2. 50
3. 450
4. 495
5. 500
in a certain formula, p is directly proportional to s and inversely proportional to r. if p=1 when r=0.5 and s=2, what is the value of p in terms of r, and s
为什么是S/4r, 不是4r/s