How much is 1 / 2 * 3 + 1 / 4 * 5 + 1 / 5 * 6 +. + 1 / 98 * 98 + 1 / 51 + 1 / 52 +. 1 / 100?

99\100

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1. If (5,7) = 74, (4,6) = 52, (3,5) = 34, then (0,4) = () a.53 b.51 c.26 d.16 There is no language in this question, there is only one law! 1、 5 * 7 * 2 + 4 = 74 4*6*2+4=52 3*5*2+4=34 So (0,4) = 0 * 4 * 2 + 4 = 4 2、 (5 + 7) * 6 + 2 = 74 （4+6）*5+2=52 （3+5）*4+2=34 So (0,4) = (0 + 4) * 3 + 2 = 2 3、 5 * 12 + 7 * 2 = 74 4*10+6*2=52 3*8+5*2=34 So (0,4) = 0 * 6 + 4 * 2 = 8
2. 90°-30°15′20〃= 15°51′×2= 55°28′+42°32′-13°27′= 176°52÷3= 90°-30°15′20〃= 15°51′×2= 55°28′+42°32′-13°27′= 176°52′÷3=
3. 34 26 105 84 65 92 98 75 78 87 91 136 46 85 52 27 51 76 39 111 38 62 135 150 225 196 169 92 74 114
4. The six numbers 85, 5L, 33, 91, 65 and 77 are divided into two groups with three numbers in each group. The product of the three numbers in each group is equal. What are they? Why? Divide the six numbers 85, 5L, 33, 91, 65 and 77 into two groups. Each group has three numbers. The product of the three numbers in each group is equal. They are sum
5. Divide the eight numbers 34, 38, 51, 55, 57, 65, 77 and 91 into two groups with four numbers in each group to make their products equal, Let's use the equation to express these two groups of equal multiplication,
6. The greatest common factor of 120 and 44? The greatest common factor of 120 and 36? The greatest common factor of 120 and 40 /
7. The greatest common factors of 51 and 68144 and 36, 33 and 88 are
8. Write the greatest common factors 35 and 40 16 and 24 13 and 36 45 and 46 55 and 44 30 and 45 3 and 10 34 and 51 for each group
9. 51.27.23.2.54.37.15.12.10.1. Which are prime numbers and which are composite numbers
10. 17 / 37
11. 1/1,1/2,2/1,1/3,2/2,3/1,1/4,2/3,3/2,4/1…… According to the above arrangement, the 51st score is ()
12. -3 21 - 51 165 - 483 -3 21 - 51 165 - 483 Not 1 2 3 4?
13. Observe the following formula: 50 × 50 = 50 ^ 2-0 ^ 2 = 2500 49 × 51 = 50 ^ 2-1 ^ = 2499 48 × 52 = 50 ^ 2-2 ^ 2 = 2496: (50-N) (50 + n)= A 20 cm long wire is folded into a rectangle. How can it be folded to maximize the enclosed area? How many square centimeters is the maximum area?
14. Observe the following formulas: 50 × 50 = 50 ^ 2-0 ^ 2 = 2500 49 × 51 = 50 ^ 2-1 ^ = 2499 48 × 52 = 50 ^ 2-2 ^ 2 = 2496 According to the above rule, if a + B = 200 (a, B are positive), what is the maximum value of AB
15. The first number plus the second number is 48, the second number plus the third number is 49, and the first number plus the third number is 51. What are the three numbers?
16. What is the sum of the following numbers? 0 12.49 12 3.50 23 4.51.49 50 51.98
17. How to use 91 to decompose the quality factor
18. 52 out of 91 decomposition quality factor
19. Decomposition quality factor 53 = 91 = 102=
20. Decompose 45 and 91 into prime factors