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?

50^2-n^2
The four sides are 5 cm, and the square has the largest area, 25 square cm

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1. -3 21 - 51 165 - 483 -3 21 - 51 165 - 483 Not 1 2 3 4?
2. 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 ()
3. How much is 1 / 2 * 3 + 1 / 4 * 5 + 1 / 5 * 6 +. + 1 / 98 * 98 + 1 / 51 + 1 / 52 +. 1 / 100?
4. 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
5. 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=
6. 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
7. 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
8. 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,
9. The greatest common factor of 120 and 44? The greatest common factor of 120 and 36? The greatest common factor of 120 and 40 /
10. The greatest common factors of 51 and 68144 and 36, 33 and 88 are
11. 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
12. 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?
13. What is the sum of the following numbers? 0 12.49 12 3.50 23 4.51.49 50 51.98
14. How to use 91 to decompose the quality factor
15. 52 out of 91 decomposition quality factor
16. Decomposition quality factor 53 = 91 = 102=
17. Decompose 45 and 91 into prime factors
18. 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
19. Gauge finding rate 0,6, - 6,18, - 30,66. What's the tenth one
20. [-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)]