1+(-2)+3+(-4)+…… +What is the number of 99 + (- 100)
1+(-2)+3+(-4)+…… +99 + (- 100) is - 50
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- 1. Find the rule, add 1 + 2 + 1, 1 + 2 + 3 + 2 + 1, 1 + 2 + 3 + 4 + 3 + 2 + 1 1+2+3+4+… +97+98+99+98+97… +4+3+2+1=______ .
- 2. Three eighths minus 0.125 multiplied by four thirteenth
- 3. Simple calculation of 1.15 * 99 + 1.15
- 4. Simple operation of 3.4x80% + 0.8 + 80% X5.5
- 5. 8 / 7-4 / 9-5 / 9 + 6 / 7, simple calculation
- 6. Simple calculation of (2 – 0.125) x 8
- 7. Four fifths, nine and four fifths, ninety-nine and four fifths, ninety-nine and four fifths, and nine thousand nine
- 8. (999 8 / 9 + 1 / 9) + (999 8 / 9 + 1 / 9) + (999 8 / 9 + 1 / 9)
- 9. 99 and three fourths + 199 and three fourths + 2999 and three fourths + 3999 and three fourths with ladder equation
- 10. Simple operation 99 ^ 2-1
- 11. 1+2+3+… +99+100+99++3+2+1
- 12. What is 1 × 2 × 3 × 100
- 13. How to calculate the difference rate of material cost?
- 14. 17 cm = () m, 0.3 km = () m, 5.6 M = () cm = () mm 320 μ M = () mm scientific counting method 820mm = () m scientific counting method 17 mm = () cm calculated by scientific notation 62 M = () cm scientific counting method 3.7m = () nanoscience notation
- 15. Can you use the adjustment formula to calculate (3 + 2) (3 ^ 2 + 2 ^ 2) * (3 ^ 4 + 2 ^ 4) (3 ^ 8 + 2 ^ 8)?
- 16. What is the formula of ring difference method in high school physics
- 17. 5, 9 out of 2, 13 out of 4, 17 out of 8
- 18. 25:5 the formula of ratio is 7:3:1 10:8 33:11
- 19. There is a mathematical symbol *, so that the following formula holds: 2 * 4 = 8,5 * 3 = 13,3 * 5 = 11,9 * 5 = 25, then 7 * 3 =?
- 20. The bottom and height of a parallelogram are reduced by a ratio of 1:3. What is the area after reduction?