Sixth grade math problem / (1 * 2) + 1 / (2 * 3) + 1 / (3 * 4) + 1 / (4 * 5) + 1 / (5 * 6) +. + 1 / (99 * 100) =? 1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+......+1/(99*100)=?

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• 1. 13+115+135+163+199+1143=______ ．
• 2. 11×12+12+13×14+.+99×100,
• 3. Find the reciprocal sum of 1 * 2,2 * 3,3 * 4.99 * 100
• 4. 1*2,2*3,3*4,4*5,5*6,…… 99 * 100, the reciprocal sum of the first 99 items
• 5. 1 times 2, 2 times 3, 3 times 4.99 times 100. Calculate the sum of the reciprocal of the first 99 terms
• 6. Calculation: (+ 1) + (- 2) + (+ 3) + (- 4) + +（+99）+（-100）
• 7. (1+2+ 3+•••+99+100)×12345=?
• 8. 1 points 2 + 2 points 2 + 3 points 2 + &_; &; &; 99 points 2 + 100 points 2=
• 9. (-c^2)^2n
• 10. 1. It is known that if the remainder of an angle is equal to 5 / 11 of its complement, then the angle is equal to () 2. It is known that the line AB and CD intersect at point O, the angle AOD = 2, the angle AOC, the angle OE bisecting the angle BOD, then the angle AOE = () degrees? 2X + 3 power of 3.2 - 2x + 1 power of 2 = ()?
• 11. It's better to have a formula and why, 3Q 1. There are eight numbers in a row. If the average number of the fifth number on the left is 36, and the average number of the fifth number on the right is 34, and the average number of these eight numbers is 32, then what is the average number of the middle two numbers? 2. The average number of the three numbers of a, B and C is 150, the number of a is 48, the number of C is the same as that of B, and the number of B? 3, In order to make the average score of the four games 145, how many points should she get in the fourth game? 4. The average of the five numbers is 11. After changing one of the five numbers to 3, the average of the five numbers is 8. What is the original number? 5. Li Na, Wang Lei and Zhang Rui bought 10 loaves of bread. They shared the bread on average. Li Na took out the money for six loaves and Wang Lei took out the money for two loaves, Zhang Rui doesn't have any money with him. After eating, Zhang Rui should take out 1.25 yuan and ask Li Na how much yuan she should take back. 6. The average score of a class is 85.13 points according to the statistics of Chinese test results. The review found that Wang Lu's 87 points are wrongly written as 78 points. After recalculation, the average score of the class is 85.31 points. How many students are there in the class?
• 12. Today's answers after 1:40 are not used 1. The ratio of adult weight to blood weight is about 13:1. Congcong's father weighs 78kg. How many kg of blood does he have? 2. There are 240 literature and art books in the school library. The number of science and technology books is 5 / 6 of literature and art books and 2 / 3 of story books. How many story books are there? 3. The TV factory actually produced 4500 TV sets in March, one eighth more than the original plan. How many TV sets will the original plan produce? 4. The two cars drive from the two places at the same time, and meet three hours later. The speed ratio of a and B is 5:4, and the distance between the two places is 270 km. Find out the speed of the two cars Four meters is one third more than () The ratio of male workers to female workers in a factory is 5:3. There are 20 more male workers than female workers and () more male workers
• 13. RT Question 1 6 / 3-P = P + 3 Question 2 10-2q = 5Q-2 out of 9 Question 3 12 (Y-9) = 6 (Y-5) Question 4 2 (- 9y-15) = - 4 (5Y + 10) Question 5: 3 / 8y-10 = 4 / 7Y + 4 Question 6 22-3y of 2 = y-6 of 5 OK, that's all. Please write down the process and don't just give an answer`` I hope to know Is the first question really - 1 / 4? I think it's like - 0.5 I'm not a kid. I'm my aunt's kid. I won't ask
• 14. The purchase rule of a commodity is: no more than 100 pieces, according to B yuan per piece; if more than 100 pieces, according to (b-20) yuan per piece. It costs a yuan to purchase no more than 100 pieces now. If 13 pieces are added on this basis, the cost is still a yuan. If the purchase price is set to be whole yuan per piece, then B yuan=______ ．
• 15. A math problem, help me! 3Q Xiao Ming counted the eggs. His mother said, "it's estimated that the number of eggs produced today will not exceed 50." Xiao Ming said, "there's only one egg left for two, four for five, and just three for three." how many eggs are there? The answer to complete, not only to the process and results, but also to the problem-solving method, this kind of answer is most likely to be the best answer Oh! 3Q
• 16. The window design of a science and technology building in a middle school is shown in Figure 1. If each symbol (window shape) represents an Arabic numeral, and each horizontal line of three symbols from left to right is regarded as a three digit number, if it is known that the windows on the four floors correspond to four three digits, they are 837571206439, then according to the rule shown in Figure 1, 1992 should be the one in Figure 2______ ．
• 17. Thank you for doing 3Q! 256.269.286.302 { } A305 B307 C310 D369
• 18. There are 330 cattle in three villages. If Zhangzhuang increases 17, Lizhuang increases 25 and Wangzhuang increases 42, then the ratio of cattle in Zhangzhuang and Lizhuang is 3:4, and the ratio of cattle in Lizhuang and Wangzhuang is 7:5_ ∩) O... Ha ha
• 19. Using isosceles trapezoid knowledge to solve mathematics problems in grade three of junior high school It is known that in isosceles ABCD, ad is parallel to BC, diagonal AC is perpendicular to BD, ad = 3cm, BC = 7cm
• 20. In the triangle ABC, ∠ BAC = 90 °, AC = 3, ab = 4, D is a point on the side BC, and ∠ CAD = 30 °, then the length of ad is () A. 65B. 75C. 85D. 95