In the parallelogram ABCD, the value of ﹥ A: ﹥ B: ﹥ C: ﹥ D can be () A. 1：2：3：4B. 3：4：4：3C. 3：3：4：4D. 3：4：3：4

According to the fact that the two groups of diagonals of the parallelogram are equal, we can choose D

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1. In the parallelogram ABCD, the value of ﹥ A: ﹥ B: ﹥ C: ﹥ D may be () A. 1：2：3：4B. 1：2：2：1C. 2：2：1：1D. 2：1：2：1
2. If ABCD is an unequal integer and ABCD = 49, find the value of a + B + C + D-1
3. For positive numbers a, B, C and D satisfying ABCD = 16, what is the minimum value of a + B + C + D,
4. If a / 3 = B / 5 = C / 7, then (a + B + C) / b =?
5. If a: B = 5:3, B: C = 7:4, then a: B: C=
6. Given that a and B are opposite to each other, C and D are reciprocal to each other, | e | = 2, find the value of formula 2 (a + b) + 2CD + E
7. If the reciprocal of a + B + D is equal to the reciprocal of C + 3, C + D is the opposite
8. If a and B are opposite to each other and C and D are reciprocal to each other, then 3a-2cd + 3B =?
9. If a ≠ 0, find the value of 3A + 3B + B / A + 1 / 2CD. Thank you!
10. 1. If a and B are opposite to each other and C and D are reciprocal to each other, then 2004 · (a + b) △ 2CD=
11. 7/10×9+7/10=? （2/3+4/9)×18=? 97×5/96=? （2/7+1/3)×3×7=? To calculate (a process) with a simple method
12. 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
13. Given a / b = C / D = E / F = 2 / 7, find the value of (a-2c + 3e) / (2b-4d + 6F)
14. Given B / a = (4d-7) / C, (B + 1) / a = 7 (D-1) / C, find C / a =?, D / b =? a. B, C and D are all positive integers
15. If we know three numbers a, B and C, 13 of a is equal to 14 of B, 78 of B is equal to 712 of C, and C is 666 larger than a, then a=______ ，b=______ ，c=______ ．
16. Given that a ratio 2 is equal to B ratio 3 is equal to C ratio 4, find a ratio B to C
17. It is known that 1 / 5 = 1 / A + 1 / B, a and B are non-zero natural numbers, and the minimum value of a + B is () a 36 B 40 C 45 D 50
18. The product of two natural numbers is 36, and the least common multiple is 120. Write these two numbers
19. ABCD represents four different natural numbers and a × B × C × d = 2709, then what is the maximum value of a + B + C + D
20. ABCD represents four different natural numbers and a × B × C × d = 2002, then a + B + C + D is the maximum and the minimum