41 1 / 3 times 3 / 4 + 51 1 / 4 times 4 / 5 =? Simple operation

31+41=72

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1. 41 and one-third × & # 190; + 51 and ×# 188; × four fifths I'm going to cram in the afternoon
2. 41 and 1 / 3x4 / 3 + 51 and 1 / 4x4 / 5 + 61 and 1 / 5x5 / 6 = how much
3. 16 out of 17 (51 * 3 out of 16)
4. fifty-one-seventeenths
5. What is the least common multiple of 5 / 17,4 / 51,2 / 3
6. 33.3,10,21,35,51,( ) A.59 B.66 C.68 D.72 34.1/4,2/5,5/7,1,17/14,( ) A.25/17 B.26/
7. 12 / 25 △ 2 △ 3 / 5 (1 / 4 * 8 / 15 + 4) / 4 / 5 simplification (with process) 3 / 2:4 / 5 33 / 5:22 1.5:51 / 2 1.125:1 / 80
8. （）：12=4:3 25：（）=5:1 51:17=39：（）
9. (1.8-4/5X)/1.2+(1.3-3X)/2+(1/2X-0.51)/0.6 (1.8-4/5X)/1.2+(1.3-3X)/2=(1/2X-0.51)/0.6
10. Least common multiple of 36.51.17
11. Calculation: 4113 × 34 + 5114 × 45 + 6115 × 56=______ ．
12. 41 and 1 / 3 × 4 / 9 + 51 and 1 / 4 × 4 / 5 + 61 and / 5 × 5 / 6 kneel down to find the formula and answer of this problem. We must use simple calculation!
13. 41 1 / 3 / 4 + 51 1 / 4 / 5 + 61 1 / 5 / 5 / 6 Please simplify the calculation, pass the equation, please
14. 41 and 1 / 3 * 3 / 4 + 51 and 1 / 4 * 4 / 5 + 61 and 1 / 5 * 5 / 6 It's good. It's closed after three minutes·····
15. (1-1 / 2005) + (1-1 / 2005 × 2) + (1-1 / 2005 × 3) +... + (1-1 / 2005 × 2004) + (1-1 / 2005 × 2005),
16. With a simple algorithm: (1 + 3 + 5 + 7. + 2005) - (2 + 4 + 6 + 8. + 2004) = who can answer?
17. The first number is 3, the second number is 10, the third number is 25, and the fourth number is 51. What is the law of this group of numbers Eager to know the answer
18. What are the multiples of 2 in 12, 30, 8, 11, 25, 51 and 16? What are the multiples of 3? What are the multiples of 5? () is not only a multiple of 2, but also a multiple of 3. () is not only a multiple of 3, but also a multiple of 5. () is a common multiple of 2,3,5
19. 17,18,13; 28, (), 19; 15,13,20; find out the rules and add the corresponding numbers in brackets
20. Given a group of numbers 2, negative 5, 10, negative 17, 26, negative 37. According to this rule, what is the nth number