Isbn: 9787211060849 - magic quick calculation (1 risultati)

paperback. Condizione: New. Paperback Pages. Number: 106 Language: Chinese. Magic quick calculation compared with other fast calculation method has the following six characteristics: 1. Advanced nature of the advanced nature of magic quick calculation is mainly reflected in two ways: First. fast. in less than 100 two-digit multiplication speed calculation. the pupils can usually be within 3 seconds to arrive at a correct answer. for some specific data. within two seconds can be calculated; a wide range of magic quick ca.…