(a+b)(a+c)+123=? You must think about this question, I have urgent need! You must take it out!

(a+b)(a+c)+123=a^2+ab+ac+bc+123

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1. Given A-B = C and a = 123, B is 3 to 7, then B = (), C = () Sixth grade fill in the blanks, help, urgent!
2. In the following four items, the legal IP address is (). A.190.220.5 b.206.53.3.78 c.206.53.312.78 d.123, 43, 82220 Please analyze in detail why it is illegal and how to distinguish legitimacy,
3. Finding all solutions of equation 123x + 57y = 531
4. Finding all positive integer solutions of equation 123x + 57y = 531
5. The sum of the largest and smallest divisors of a number is 123, and this number is 123______ ．
6. The sum of three continuous natural numbers in the equation is 123. What are the three numbers
7. 1 * 2 * 3 * 4 * 5 * [123 * 123] how to make it the simplest? How can it be completed in one step? Can't use computer
8. How to calculate 123 × 181 + 123 × 119
9. Xiaohua walked three times on the 60 meter track, 119 steps in the first time, 118 steps in the second time and 123 steps in the third time. How many meters is Xiaohua's average step length? He walked 1500 steps from home to school. How many meters is it from Xiaohua's home to school?
10. Solving binary linear equation x ^ 2 + 25x-123 = 0 I have no calculator
11. A / 5 + B / 4 + C / 3 = 0.4 (1) a / 4 + B / 3 + C / 2 = 0.5 (2) a / 3 + B / 2 + C = 1 (3), 123 forms a system of linear equations with three variables to solve a, B and C
12. A = - 123.4 - (- 123.5), B = 123.4-123.5, C = 123.4 - (- 123.5), then () A. c＞b＞aB. c＞a＞bC. a＞b＞cD. b＞c＞a
13. There is a set of data: 42, 44, 44, 46, 48, 48, 48, 50, 51, 51, 56______ The mode is______ ．
14. Among the numbers 3, 15, 22, 51, 78, 60, 83, 210, 29 and 56, odd numbers are: even numbers are: prime numbers are: composite numbers are: multiples of 2 The multiples of 3 are: the numbers with factor 5 are () the numbers with 2, 3 multiples are () the numbers with 3, 5 multiples are () the numbers with 2, 3, 5 multiples are () at the same time（
15. 108°18′+56°23′40〃
16. The solutions of 108 ° 18 '- 56 ° 23' are expressed in degrees
17. How to solve 108 ° 18 ′ + 56 ° 23 ′ 40 ″,
18. Calculation: 108 ° 18 ′ - 56 ° 23 ′=______ ．
19. In the fifth grade, oral arithmetic is practiced every day from 42 to 45, 51 to 54
20. 36,9,42, (), (), 51, () can only add and subtract. Please explain the solution