First: I think you are confusing a class import with a static import.
You can always use a class, without importing, using its fully qualified name. For example:
To avoid using the FQN, you can import a class.
int biggest = java.lang.Math.max(a, b);
Note that you never need to do this for classes in the java.lang package, since they are automatically imported.
int biggest = Math.max(a, b);
In Java 5 (and later), you can use a static import, and access static members of a class without the class name.
This last form cannot be used when developing for mobile, since you must use Java 1.2 source code. You should also avoid it when developing J2SE or J2EE, since it is generally a pretty horrible programming construct.
import static java.lang.Math.*;
int biggest = max(a, b);
So, you don't need to import the Math class. Just use it.
Second: the CLDC Math class does not have the methods you mention. Check the JavaDocs for a list of available methods. Note that the methods available in the Math class are different between CLDC-1.0 and CLDC-1.1, so you will need to decide which standard you are targetting.