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(7年级)1.将一个正方形分成16个相等的小方格。将4个字母A、B、C、D的每一个这样地填入这些小方格上四次,使任何一条水平线、任何一条竖直线和两条大对角线上没有相同的字母。2.试画最少的曲线(圆和直线,用圆规和直尺),以作出一条直线通过一个已知点且平行于一条已知直线。3.在一个暗室里,4双短袜子(两种不同大小和两种不同颜色)杂乱无章地放在一个架子上。如果不离开房间,需要从架子上取下多
(Grade 7) 1. Divide a square into 16 equal squares. Each of the four letters A, B, C, D is filled into these squares four times, so that no horizontal lines, any vertical lines, and no two large diagonal lines have the same letter. 2. Draw the least curves (circles and straight lines, using compasses and rulers) to make a straight line through a known point and parallel to a known straight line. 3. In a dark room, 4 pairs of short socks (two different sizes and two different colors) are placed on a rack in a disorderly manner. If you leave the room, you need to remove it from the shelf