Mathematical recursive equation calculation (with clever calculation) in the fourth grade

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1. Help me solve a few mathematical recursive equations, clever calculation, crab! To clever calculation Oh~ 1、15.72-4.38÷2.4 2、7.2×2.02÷2.4 3、9.8×25
2. Good, fast, add 200. If you can do it skillfully, do it skillfully 1.11.6*【18.4-12.74/（6-1.1）】 2.0.96/1.6*50-2.4*5.5 3.9.05+0.4/0.25*（8.3-4.6） 4.（28.8-25.12）/20*【2/（4.1-4.09）】 5.24*8.7/24*8.7 6.8.4*1.92+8.4*8.18-0.84 7.99.8*4.7 8.7.2*9.7+97*0.28
3. It must be in the fourth grade
4. Simple operation (recursive equation) (see supplementary question for details) 68×32-784÷56 It must be a simple operation Answer with a reward
5. How simple is how to calculate the recursive equation Oh! 8.73+9.99 = =
6. How to calculate 265 + 378 + 398 with recurrence equation?
7. How to calculate 125 × 32 with recurrence equation
8. How to calculate 54 × 18 + 27 × 64
9. 18,-27,36,( ),54
10. Mathematical recursive equation calculation urgent! （127×97-97×2）×8 If you can do it skillfully, do it skillfully
11. Find the law 1,2,2,3,4,6,9, () want to know how to work it out 1,2,2,3,4,6,9,（）（）（） I want to know how to figure it out
12. (-1)^6-1^6*(1/2-1/3)\1/3-|-2|.
13. Calculation: 2011 times of (- 2) + 2010 times of (- 2) =? Try to explain that three times of 99 - 99 can be divided by 98 Decomposition factor: X & sup2; - 9 =? x²+2x+1=?
14. How to calculate cos1.2? Will the exam allow you to use tools?
15. Mathematical problems: calculation: 2 √ 2 + 5 √ 2 = (), 3 √ 5 ×√ 5 = ()
16. Help me to work out this math problem For a non-zero natural number, the operation is as follows: if it is even, divide it by two; if it is odd, add 1. The operation does not stop until the number is 1. How many numbers have changed to 1 after 9? Also, I'm in a hurry. I'll be in a hurry in 10 minutes
17. 1-x = square of change sign 3 × X - change sign 3 × x
18. (- 1.8) + (+ 0.7) + (- 0.9) + 1.3 + (- 0.2) using the operation law of rational number addition
19. Using the operation law of rational number addition to calculate: (1) (- 0.5) + 17 of 4 + (- 19 of 2) + 9.75; (2) 1 and 3 of 4 + (- 6.5) + 3 of 4 3 of 8 + (- 1.75 + 2 and 5 of 8); (3) (- 3.5) + (- 4 of 3) + (+ 7 of 2) + 0.75 + (- 7 of 3)
20. How to solve the addition operation of rational number (- 1 / 2) + 31 / 4 + 2.75 + (- 61 / 2)?