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有理函数（续）
什么是有理函数？
1. Applications of rational functions
Applications of rational functions
2. Summary
Summary
3. Cylinder surface area as a rational function
A closed cylinder holds 20 cubic feet. Why is the material needed a rational function of its radius?
4. Box surface area in one variable
An open box has base 2x by x and volume 15, so h = 15/(2x^2) and S(x) = 2x^2 + 45/x. What is S when x = 3?
5. Cheapest can by inspection
For S(x) = 2x^2 + 45/x, roughly where does the least material usage occur?
6. Domain and asymptote of a rational function
For f(x) = (17x^2 + 34)/(19x^2 - 76), what are the domain and horizontal asymptote?
7. A rational function is undefined at its denominator's zeros
A rational function's domain excludes every input that makes its denominator zero.