The fifth question on page 10 of mathematics class assignment book of grade 6 Volume 2 Cut a cylinder into four sections parallel to the bottom. The surface area increases by 180 square centimeters. The original height is 20 centimeters. What's the volume of this cylinder

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3. (1) There are two sizes of hot water bottles in the box. The big one can hold seven and the small one can hold four. To put 41 hot water bottles into the box, how many boxes are needed? (2) One yuan for 12 stamps, including four, eight and twenty cents. How many did you buy? Please solve all the equations
4. What are the rules of sequence 4, 16, 37, 58, 89145 So this sequence will be a cyclic sequence, right?
5. What is the next number in the sequence 298 209 129 58 - 4? A,-13 B,-93 C,-66 D,57
6. Sequence 1, 2, 4, 12, 27. What's next? The answer is 58,
7. Answers to page 55 of PEP's mathematics homework Design a 400 meter track for the school (1) The length of the straight runways on both sides of the 400 meter runway is 100 meters, and how long is the diameter of the two semicircles? (the width of the standard runway is 1.25 meters, and the number obtained remains integer.) (2) What is the area of the lawn on the inside of the runway (3) Long and Qingqing walk around the inside and outside of the runway. How many meters is the difference between them
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9. Answers on page 30 of PEP's mathematics homework fifth six .7 .8 .9 .10. A two place decimal is rounded to the nearest three point zero. The maximum is () and the minimum is () the difference between them If the original price of the dress is 200 yuan, now it's only 8 yuan. Just read a decimal point. When you write it, you forget to write the decimal point. As a result, it turns out that the decimal point may be () or () 9 The sum of the numerator and denominator of a fraction is 55. If both numerator and denominator are subtracted by five, the new fraction will be about one fourth. The original fraction is () 10. If you triple its decimal part, the number will be 2.2. If you multiply its decimal part by seven times, the number will be () 3.8
10. On the 1:6000000 scale map, the distance between Nanjing and Beijing is 15cm. How many kilometers is the actual distance between Nanjing and Beijing?
11. Ask for the answer on page 13 of mathematics class assignment book of grade 6 Volume 2
12. Final examination of mathematics exercise book for Grade 6 Volume 2 of Jiangsu Education Press fast
13. Answer to the second question on page 34 of mathematics exercise book (Volume 2, grade 6, Jiangsu Education Press)
14. Calculation of 999x58 + 558 by simple method
15. (386 + 142) + (14 + 58) = calculated by simple method
16. How to calculate (26 + 120-58) × 4 with a simple method?
17. (-5\8)*（-3.58）-（5/8)*(-3.42)-(-5|8)*7 Within today
18. (67.8+9.48)÷0.96-2.58×3.35 ：(67.8+9.48)÷0.96－2.58×3.35 Simple operation
19. It can be easily calculated by simple method. 40 × 95 + 5 & nbsp; & nbsp; & nbsp; & nbsp; 102 × 58-116 & nbsp; & nbsp; & nbsp; & nbsp; 11 × 203-3 (200 + 3) × 14 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 125 + 4 × 95 & nbsp; & nbsp; & nbsp; & nbsp; (7 × 125) × 8
20. Simple calculation of (67 × 76 + 76 × 58) × 8 and 79 × 125