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If a, B, C, D are mutually unequal integers, and ABCD = 49, find the value of (a + B + C + D-1) ^ 2013
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- 16. -4/9,10/9,4/3,7/9,1/9 A．7/3 B 10/9 C -5/18 D -2 -4/9,10/9,4/3,7/9,1/9 A．7/3 B 10/9 C -5/18 D -2
- 17. If a, C, D are integers and B is a positive integer, and a + B = C, B + C = D, C + D = a is satisfied, then the maximum value of a + B + C + D is () A. -1B. -5C. 0D. 1
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- 19. Given that a, B, C are all positive integers, and B / a = 4d-7 / C, B + 1 = 7 (D-1) / C, what is the value of C / a? What is the value of D / b? To analyze. Fast. Urgent
- 20. A. If there are three numbers B and C, 2 / 3 of a equals 4 / 7 of B, 2 / 3 of B equals 4 / 7 of C, and C is 1 / 3 larger than a, then B is A. If 23 of a is equal to 47 of B, 23 of B is equal to 47 of C, and C is 13 greater than a, then B is () There are 15 students, each student has a number, which is 1 to 15 in turn. No. 1 wrote a five digit number, No. 2 said: "this number can be divided by 2", No. 3 said: "this number can be divided by 3", No. 4 said: "this number can be divided by 4" Students on the 15th said: "this number can be divided by 15.". The students of No. 1 checked one by one. Only the two students with consecutive numbers said that they were wrong, while the others were right