1）一个cube total surface area 382 square ft,求所有边长

题目

1）一个cube total surface area 382 square ft,求所有边长
2）If N is positive number,the prime number of between N+1 and N+6 cannot be

答案

设立方体边长为x,则6*x^2=382 x=7.979 ft
2)N>0,设the prime number 为x
因为N+1>1,N+6>6,所以x>1,so