求解三道GWD数学题~~

DAIXIAOQIAN

1：A researcher plans to identify each participant in a certain medical experiment with a code consisting of either a single letter or a pair of distinct letters written in alphabetic order.What is the least number of letters that can be used if there are 12 participants, and each participant is to receive a different code?

2：Can a certain rectangular sheet of glass be positioned on a rectangular tabletop so that it covers the entire tabletop and its edges are parallel to the edges of the tabletop?

(1)The tabletop is 36 inches wide by 60 inches long.

(2)The area of one side of the sheet of glass is 2,400 square inches

3：If n is a positive integer, what is the value of n ?

(1)When n is divided by 3, the remainder is 2.

(2)When n² is divided by 3, the remainder is 1.

3：If n is a positive integer, what is the value of n ?

(1)When n is divided by 3, the remainder is 2.

(2)When n² is divided by 3, the remainder is 1.


2：Can a certain rectangular sheet of glass be positioned on a rectangular tabletop so that it covers the entire tabletop and its edges are parallel to the edges of the tabletop?

(1)The tabletop is 36 inches wide by 60 inches long.

(2)The area of one side of the sheet of glass is 2,400 square inches

3：If n is a positive integer, what is the value of n ?

(1)When n is divided by 3, the remainder is 2.

(2)When n² is divided by 3, the remainder is 1.

3：If n is a positive integer, what is the value of n ?

(1)When n is divided by 3, the remainder is 2.

(2)When n² is divided by 3, the remainder is 1.

elvaxiaobai

LZ 你粘贴了多少遍
1 12？？？？都用single
2 这个E吧 又不知道长宽怎么弄？
3 我觉得也是E   n=2或者5都行 试数试出这两个

jasonsun802

1.不确定，同楼上的12.
2.E，同楼上，不知道玻璃长宽。
3.E.  n=3x+2    n^2=9x^2+12x+4, (9x^2+12x+4)/3=（3x^2+4x+1)余1，所以任意x都成立。