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数与形,本是相倚依,焉能分作两边飞?数缺形时少直观,形缺数时难入微。数形结合百般好,隔离分家万事休。切莫忘,几何代数统一体,永远联系不分离。——华罗庚【题目】第1题把一个正方体纸盒沿着它的几条棱拆开(剪断),可以使它完全展开在平面上,得到一个平面图形;反过来,再把这个平面图形中一部分小正方形的边两两粘贴,使其重合在一起,则可使平面展开图恢复成正方体。正方体中任意相邻两个面重合(相交)处的线段,称为正方体的棱,其长度等于代表某个面的正方形的边
Number and shape, this is dependent on the phase, how can be divided into fly on both sides? Hundreds of good combination of shape, isolation, everything off. Do not forget, geometric algebraic unity, never be separated. - Hua Luogeng Problem 1: Disassemble (cut off) a cube carton along a few of its edges to make it fully flat on the plane to obtain a plan; in turn, put the plan in the plane Part of the small square of the two sides of the paste, so that they overlap, you can make the plane expanded to restore the cube. The line segment where any adjacent two faces in a cube coincide (intersect) is called the cube’s cube and has a length equal to the length of the square that represents a face