Make a big square with gray square bricks, with white tiles in the middle and gray tiles around. For the first time, * * * nine tiles surrounded by eight gray tiles, one white tile in the middle, sixteen tiles in the second time, twelve gray tiles in the middle, twenty-five tiles in the third time, sixteen gray tiles in the middle and nine white tiles in the middle. (1) If 20 * is used for the spelled figure, (2) If 400 gray tiles are used for the spelled figure, then () are used for the white tiles?
92 employees of a company are going to the Grand Hotel for dinner. There are two kinds of dining tables in the hotel: a table for 8 people and a table for 6 people. If you are a waiter, how do you arrange to minimize the number of tables used, and there is no room at each table?
During the holiday, Xiao Bing and Xiao Jun competed to climb the stairs. When Xiao Bing climbed to the seventh floor, Xiaojun just climbed to the third floor. At this rate, when Xiao Bing climbed to the 16th floor, which floor did Jun Xiao climb?
5\ There are 1 coin, 2 coins, 5 coins ***3 1 coin, and their total is 78 cents. 1 There are as many coins as there are 2 coins. What are the numbers of two coins and five coins? How to calculate in the form of columns?
6, a batch of colored pencils to the first grade, each class 2 boxes more than 3 boxes, each class 3 boxes less than a box, ask the first grade total * * * how many classes? How many boxes of colored pens do you always buy?
7. Student Liu Fang asked the math teacher Zhang's age, and Teacher Zhang said; "15 before my age and your age after 6 years. Seven years ago, I was eight times your age. " Would you please calculate Mr. Zhang's age now?
9. Three bud sticks can form a triangle. How can three buds stick to form four triangles?
10, from A to B, *** 1600 meters, 4 hours in A and 2 hours in B. If you walk for 2 hours, how many meters is the distance between A and B?
1 1. There are two cars carrying a batch of aid materials, with car A carrying 5 times and car B carrying 8 times. Car A carries 4 boxes more than car B at a time, and car A carries 13 boxes less than car B when completing the task. How many boxes does car B carry at a time?
12, three people have different deposits, knowing that A gave B 40 yuan, B gave C 30 yuan, C gave A 29 yuan and B 70 yuan, so each of them has 240 yuan. How much does each of them have?
13. There is a long grassland 48 meters long and 30 meters wide. Trees should be planted on both sides of the 6-meter-wide walkway around to ensure that there is a tree in every corner with equal spacing. How many trees should be planted at least?
14. There are 240 peach trees in the orchard, which is twice as few as pear trees. How many pear trees are there?
15, dividends. Frequency divider. The sum of the quotient and the remainder is 39 1, the known remainder is 4, the quotient is 1 1, and what is the dividend?
16. When Xiao Wei calculated the addition of two numbers, he misspelled 1 plus "7" on hundreds of digits into "1" and misspelled "4" on the digit 10 into "9", so the calculated sum was 243. What should be the correct sum?
17, Miss Wang's telephone number is seven digits. Add the first four digits and the last three digits to get 9063, and then add the first three digits and the last four digits to get 2529. What is the number?
18, four kilograms of apples and three kilograms of pears ***24 yuan, three kilograms of apples and four kilograms of pears ***25 yuan, how much are the apples and pears?
19. It was originally planned that 60 people would work for 80 days to build an expressway. Now working for 20 days and adding 30 people, how many days will it take to finish?
20, 10, 15, 20, 30, 40, 60, 3 channel product equality formula
2 1,1.2.3.4.5.6.7.8.9 =100, only one+and two-can be used.
22.() ×( )=20. If one factor is constant and the other factor is divided by 5, the product is ().
23. There are several red, white and yellow balls of the same size. If arranged in the order of 3 red, 4 white and 5 yellow from left to right, what color is the1000th ball? /kloc-How many yellow balls are there in 0/000 balls?
24. There are five numbers, and the average of these numbers is 87, of which the average of the first three is 79.5, and the average of the last three is 80.7. What is the third number?
25. There are several red, white and yellow balls of the same size. If arranged in the order of 3 red, 4 white and 5 yellow from left to right, what color is the1000th ball? /kloc-How many yellow balls are there in 0/000 balls?
26. Two-digit figures. Ten digits are four times more than one digit. The sum of one digit and ten digits is equal to 1 1. Find this two-digit number.
27. Three vests. Two pairs of trousers * * spent 140 yuan, and three pairs of trousers of the same two vests ***200 yuan. How much is each vest? How much is each pair of trousers?
28、 (2003+200 1+ 1999+...+3+ 1)-(2002+2000+ 1998+...+4+2)=
29. Uncle Liu spent 246 yuan to wholesale 82 Jin of litchi, bought 60 Jin at the price of one Jin of 4 yuan, and bought the rest at the price of one Jin of 3 yuan. How much did Grandpa Liu earn? (Try two solutions)
30. Students in six classes in Grade Four have a radio exercise competition. If there are three students in each row, there will be one more, if there are seven students in each row, there will be five more and if there are 1 1 students in each row, there will be nine more. How many students are there in Grade Four?