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Find the rules and fill in the blanks (4 / 3, 1 / 9, 8 / 5)
Add 3 to the denominator and 2 to the numerator, which is the next number, so it should be 2 / 12
The number that is less than four fifths of a number is 28. Find this number. Use the formula
This number is:
(28 + 12) △ 4 / 5
=40 △ 4 / 5
=50
So the number is 50
Three fifths of a number is 28 less than two times his. What's the number
Another question: 6X1 / 12-1 / 2x = 1 / 2
Question 1 28 (2-3 / 5) = 12
Question 2 1 / 2-1 / 2x = 1 / 2
When 1 / 2-1 / 2x = 1 / 2, x = any number
When 1 / 2-1 / 2x ≠ 1 / 2, the equation has no solution
RELATED INFORMATIONS
- 1. The number 32 less than four fifths of a number is 28. Find this number
- 2. 7 / 5 of a number is 27 more than 3 / 8 of it. What's the number
- 3. For a fraction, the numerator minus 1 equals 1 / 3; the denominator minus 1 equals 1 / 2. What's the number? Primary school mathematics book 10 thinking questions
- 4. There's a fraction where the addition of 2 to the molecule equals 3 / 5, and the subtraction of 2 from the molecule equals 1 / 3
- 5. 5:8 to 1:4 (ratio) 0.6 to 1:2 (ratio) 0.5T to 200g (reduction ratio) 5:16 to 0.25 (reduction ratio) 0.36 to 6 0.8 * 2 / 3 + 1 / 5 / 0.75
- 6. 54 out of 35 to 3.5
- 7. Observe the following formulas: 21-12 = 9; 75-57 = 18; 96-69 = 27; 84-48 = 36; 45-54 = - 9; 27-72 = - 45; 19-91 = - 72 (1) Please complete the above rule with words: exchange the ten and one digits of a two digit number. What is the difference between the new two digits and the original two digits______ (2) can you explain this rule with what you have learned? Give it a try
- 8. There are 440 boys in Hongxing primary school. The number of boys is 22 / 15 of the number of girls. What is the number of the whole school? Use equation to calculate equation
- 9. The number of female students is two fifths less than that of male students. What number is two fifths equal to
- 10. Two fifths of a number is 60. What's 20% of the number,
- 11. Fill in the blanks according to the rule: 160%, 120%, two fifths, 0
- 12. What is the ratio of 0.125:5 in 8? What is the ratio of 7 in 12:3 in 8
- 13. Two fifths × two thirds + two fifths ／ two thirds = [] [process, simple calculation]
- 14. Simple calculation: 24 / 5 × 11 / 8 + 61 / 10 △ 8 / 5 + 13 / 10 × 11 / 8
- 15. Two thirds X: two fifths = fifteen sixteenth: eight ninths
- 16. Thirteen by two fifths by one thirteenth by five seventeen It's necessary to make the calculation simple and urgent!
- 17. The ratio is 1 / 4 to 1 / 9, 0.5 to 0.015, 7 / 5 to 5 / 2, 2 / 5 tons to 800 kg, and 1 / 4 to 20 Three quarters of a meter is more than 750 meters
- 18. The following problem is to write the calculation process: one minus two fifths =? Five fifths minus fourteen fifths =? Eight ninths minus five sixths =? One sixth and three eighths =? Solving equation: (write calculation process) Half plus x = 5 / 6 x minus 7 / 10 = 1 / 5 x plus 1 / 4 = 1 / 2
- 19. Seven eighths by six means ten by seven eighths, one sixth by two fifths
- 20. A Mathematical Olympiad in primary school Fill in the brackets below with seven numbers 0123789 to make it true （）＋（）＝（）－（）＝（） Two of the brackets are two digits