1, the symbolic representation of each surface;
2. Formula representation. (Be sure to remember it well, so that you can remember and understand the following formula. )
A third-order Rubik's cube can be understood as "top", "middle" and "bottom" from top to bottom. The so-called "layer first method" is to restore layer by layer. The restoration of the third-order Rubik's cube by the "layer priority method" is divided into the following six stages:
The first stage: for the top span, restore the top edge block.
The second stage: restore the top corner block.
The third stage: restore the middle prism.
The fourth stage: for the bottom span, restore the bottom edge block.
The fifth stage: turn over the bottom corner block and align the background color.
The sixth stage: adjust the position of the bottom corner block and restore.
As shown in the figure below:
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Extended data:
The history of the Rubik's Cube—
1, early attempt
1970 In March, LarryNichols invented "PuzzlewithPiecesrotatable Groupings" and applied for a Canadian patent. It is a 2×2×2 Rubik's Cube, but each Rubik's Cube is attracted by magnets. 1972 obtained the American patent, two years earlier than Professor rubik's third-order Rubik's Rubik's cube.
Step 2 start
Ern Rubik is a Hungarian professor of architecture and sculpture. In order to help students understand the composition and structure of the space cube, he made the first prototype of the Rubik's Cube, inspired by the gravel in the Danube.
1974, Professor rubik invented the first Rubik's Cube (then called MagicCube), and obtained the Hungarian patent number HU 170062 in 1975, but did not apply for an international patent. The first Rubik's Cube was sold in a toy store in Budapest in 1977. Unlike Nichols' Rubik's Cube, Professor Rubik's Cube's parts are interlocking like tenons, which are not easily separated by external forces and can be made of any material.
1979 In September, IdealToys brought the Rubik's Cube to all parts of the world, and made its debut at the international toy fairs in London, Paris and the United States in February and October. 1 980. After the exhibition, IdealToys renamed the Rubik's Cube as 1980 May, and the first batch of Rubik's Cube was exported to Hungary.
3. popular
Rubik's cube was widely loved by the public in 1980, and nearly 2 million Rubik's cubes were sold from 1980 to 1982. 198 1 year, PatrickBossert, a little boy from England, wrote a book called You Can Restore the Rubik's Cube (ISBN 0-14-031483-0), which sold nearly 650 * *. It is estimated that in the mid-1980s, one fifth of the people in the world were playing Rubik's Cube.
4. Development
Due to the huge business opportunities of the Rubik's Cube, 1983, Professor Rubik and his partners developed the second-order and fourth-order Rubik's Cube together. And in 1986, a fifth-order Rubik's cube was made.
In 2003, PanagiotisVerdes Company of Greece applied for the patent of Rubik's Cube of 5× 5 to/kloc-0 /×1×11(the structure of the fifth-order Rubik's Cube is slightly different from that of the professor's Rubik's Cube), and it was awarded to V-in 2008.
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