How to simplify the calculation from 1 x 1 / 2 plus 2 times 1 / 3 and so on to 49 times 50

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• 1. When calculating the following questions, those who can be easily calculated must be easily calculated! (4 / 5 + 1 / 2) × 26 / 27 [5 / 6 - (1 / 2-1 / 3)] × 2 / 50
• 2. Some very simple calculations... X / 880 + X / 760 = 9 (3 / 8 + 2 / 5) * 8 + 9 / 27 0.36 + 0.64 △ 1.6 How to solve the problem of X / 880 + X / 760 = 9 (3 / 8 + 2 / 5) * can 8 + 9 / 27 be operated easily? I think it can, but I don't know how to do it. If it's not easy, the answer is hundreds of hundreds Can 0.36 + 0.64 △ 1.6 be simple?
• 3. Simple calculation of 6.4 × 4.5 + 3.6 × 45 I'm in a hurry
• 4. 37 * 75 + 125 * 45 =? Simple calculation
• 5. (1) （5/9*4.5-2/1.25)/7 (2) (4-35/65*5.2)/0.01 (3) 18.25*59/5-(17+1/4)/(1-54/59) (4) 0.1/(3.3-(2.4+18/5/6)) (5) 0.5*236*59/119
• 6. Simple calculation of 28.9 * 61.3 + 111 * 6.15
• 7. 15.39 + 3.96-6.61 = how much, simple operation Remember, simple operation
• 8. 3 / 4 * 7 / 9 / 3 / 4 * 3 / 14
• 9. Simple operation: (1 and 7 / 9) ^ 11 * (9 / 16) ^ 11 * (- 1) ^ 11 =? Before nine, thank you!
• 10. How to calculate 27 × 3.7 + 37 × 7.3 simply?
• 11. Simple operation of 48 × 49 + 48
• 12. 2.73 × 8.5 + 15 × 27.3 =? Simple calculation~
• 13. Simple operation: (1 / 27-1 / 36) △ 1 / 9 7 △ 5 × (5 / 7 + 5 / 28)
• 14. A simple method of 1.28 * 0.59-0.28 * 0.59
• 15. 72 * 72 + 72 + 72 * 27 * 72 by simple method
• 16. How can five fourths times nine eleven plus thirteen fourths times five eleven be easily calculated? Five minutes, quick! And three quarters by one fifth plus three quarters by two fifths plus 0.75 by three fifths minus three fourths
• 17. What's the product of two-thirds minus one-quarter difference multiplied by the reciprocal of twenty-one?
• 18. 96 times 19 / 93 and 3 / 5 times 7 plus 0.6 times 4-3 / 5
• 19. 9.6*89/1993+1103*24/25*1993
• 20. How much is 25 / 3 times 12 / 5? How to calculate?