一个长方体的地面积是21,另外,其中一个面的面积是30.
请问体积是多少?答案是220.
1,The area of the base of the rectangular box is 21 and the area of one of the faces is 30.Each of the dimensions j,k,and l is an integer greater than 1.What is the volume of the rectangular box?（答案是220）
If n>1 and each of the three integers n,n+2,n+4 is a prime number,then the set of three such numbers is claaed a"prime triple"There are how many different prime triples?（答案是1）