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Who can illustrate the abacus or explain the calculation method of the abacus in spoken language?
Abacus pithy formula is the principle of abacus four operations. Recite it in the form of "pithy formula", and then carry out operations. For example: the addition pithy formula table does not carry, add carry directly, add full five, add ten, break five, enter ten, add one by one, one by one, five to four, one to nine, one by two, two by two, five to three, two to eight, one by three
RELATED INFORMATIONS
- 1. Change the operation order of 671 + 29 × 4 ÷ 2 to sum first, then to product, and finally to quotient______ ．
- 2. (- 15) how much is 16 times yourself What do I say is equal to? What is the 16th power of minus 15
- 3. How much is 8 times 12.5%?
- 4. Can you tell me how these figures are equal to six It's OK to add, subtract, multiply and divide, as long as it's equal to six These numbers can't be changed,
- 5. 14-（-12）+（-25)-17=
- 6. What is 2 * sqrt (3-2 * sqrt (2)) + sqrt (17-12 * sqrt (2)) The sqrt above means the root sign. How to solve this problem, the final result is 1,
- 7. 16 degrees 4 seconds divided by 5 =?
- 8. How much divided by 2 / 3 = 3 / 4
- 9. 39 times 50 () 2000 62 times 31 () 1800 52 times 29 () 30 times 52 19 times 38 () 20 times 40 The brackets must be greater than, less than or equal to
- 10. What is 9310 divided by 4900
- 11. Can abacus calculate multiplication and division?
- 12. 6.47*52+64.7*4.8
- 13. 150 three step recursive equation calculation problem urgent! There must be three steps
- 14. Simple calculation: 12 × (11 / 12-7 / 30) × 30 4 and 1 / 5-1 / 6 - (5 / 2-5 / 6) 4.38-1.56 + 0.62-0.44 13 out of 16 × (9 out of 13 × 17-9 out of 13)
- 15. Simple calculation of 0.56 times 301
- 16. Simple calculation of (3 / 8 + 2 / 17) × 8 + 1 / 17
- 17. Can you draw a 15 degree angle with a triangle ruler?
- 18. How much is 1000 plus 40 plus 1000 plus 30 plus 1000 plus 20 plus 1000 plus 10
- 19. The students went to plant trees. In the first group, 20 trees were planted at 30 points, and in the second group, 12 trees were planted at 18 points. Which group planted trees faster than others in the same lesson,
- 20. Four (1) class students plant trees, each plant one tree, there are 20 trees left, each plant two trees, the difference is 30 trees. How many students? How many saplings?