A69 10 and A69 15 are divisible by 1 1: the difference between the sum of odd and even numbers is divisible by 1 1.

There are 969 10 and 469 15.

2. 1996* 1994 19994 1994- 1994* 1996 1996 1996

= 1996* 1994* 1000 1000 1- 1994* 1996* 1000 1000 1=0

1992=2*2*2*3*83=2^3*3*83

The divisor of 1992 * * is (3+1) * (1+1) * (1+1) =16.

16 divisor: 1, 2, 3, 4, 6, 8, 12, 24, 83, 166, 332, 668, 249, 498, 996,/kloc.

Where1*1992 = 3 * 668 = 8 * 249 = 24 * 83.

There are four such rectangles.

It should be a cube with a length of 1 m-

The surface area increases 1 m2× 2 with each cut.

A * * * cuts 2+3+4=9 knives, and the surface area * * * increases by 9*2= 18 square meters.

The total surface area of 60 cuboids =6+ 18=24 square meters.

Prime number: a number whose greatest common divisor is 1