What is the sum of the following numbers? 0 12.49 12 3.50 23 4.51.49 50 51.98

1225 1275 1325 4851

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1. 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?
2. 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
3. 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?
4. -3 21 - 51 165 - 483 -3 21 - 51 165 - 483 Not 1 2 3 4?
5. 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 ()
6. How much is 1 / 2 * 3 + 1 / 4 * 5 + 1 / 5 * 6 +. + 1 / 98 * 98 + 1 / 51 + 1 / 52 +. 1 / 100?
7. 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
8. 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=
9. 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
10. 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
11. How to use 91 to decompose the quality factor
12. 52 out of 91 decomposition quality factor
13. Decomposition quality factor 53 = 91 = 102=
14. Decompose 45 and 91 into prime factors
15. Observe the number of columns given below: 0,6, - 6,18, - 30,66 Then the tenth number is_____________ ． Find the law of this group of numbers
16. Gauge finding rate 0,6, - 6,18, - 30,66. What's the tenth one
17. [-2,4,-8,16,-32,64.(1)] [0,6,-6,18,-30,66.(2)] [-1,2,-4,8,-16,32.(3)] What is the order of the first row and what is the number n What is the relationship between the second, third and first lines Take the tenth number of each row and calculate the sum of the three numbers [-2,4,-8,16,-32,64.........(1)] [0,6,-6,18,-30,66.........(2)] [-1,2,-4,8,-16,32..........(3)]
18. Here is a regular array of triangles First line: 1 The second line 1 Third line: 1 2 1 The fourth line: 1 3 3 1 The fifth line: 1 4 6 4 1 The sixth line; 1 5 10 10 5 1 . What is the third number from the left of line 1997 Not only the answer, but also the method,
19. Observe the numbers in each column in the following order, fill in the following two numbers according to the rule, and write the 55th and 100th numbers. (1) - 2,4, - 6,8, - 10,12_____ ,_____ , 55th number (), 100th number () [2] 1, - 1,1, - 1,1, - 1 -, -. 55th number (), 100th number ()
20. Arrange 1, 2, 3, 4. Into the following matrix according to certain rules: 1 2 5 10. 4 3 6 11. 9 8 7 12 . 16 15 14 13. .... So, what's the number in row 3 (from top to bottom) and column 6 (from left to right)?