2. Reading 80 pages a day can't be finished in 4 days, and there are more than 5 days; Read 90 pages a day, you can't finish it in 3 days, and there are still more than 4 days; If you read n pages every day, it only takes n(n is a natural number) days to finish reading. The number of pages in this book is _ _ _ _ _ _.
3. Party A and Party B play games and arbitrarily specify 9 consecutive integers. A fills these integers in the first row of boxes as shown in the figure in any order, and then B fills these 9 numbers in the second row of boxes in any order. Finally, multiply all the differences of two numbers in the same column (***9), and stipulate that if the product is even, A wins; If the product is odd, b wins. Then _ _ _ _ _ wins. (Fill in "A" or "B")
4. Enclose a rectangle, the length is16m, the length and width are equal to _ _ _ _ _ respectively, and its area is the largest, with the largest square centimeter of _ _ _ _ _ _ _.
5. There are four natural numbers, each of which is not divisible by the other three numbers, but the product of any two of them can be divisible by the other two numbers. The sum of these four numbers is at least equal to _ _ _ _ _ _.
6. As shown in the figure, in the quadrilateral ABCD, ∠ B = 90, AB=4, BC=3, CD= 13, DA= 12. The area of the quadrilateral ABCD is equal to _ _ _ _ _.
7. 124 students play cards in groups of four, the winner stays to continue the game, and the other three are eliminated. In this way, * * * needs to play _ _ _ _ to decide the champion.
8. There are several piles of Go, each pile has the same number of pieces, and albinos account for 36%. Xiao Ming took half of the first pile (all black spots), and Xiao Guang mixed the rest of Weiqi together, and found that Bai Zi just accounted for 40%. You know there used to be _ _ _ _ piles of chess pieces.
9. Six faces of four identical dice are written with 1, 2, 3, 4, 5 and 6 respectively. They are stacked together (as shown in the figure) to form a cuboid. The antonym of 1 is _ _ _ _ _, the antonym of 3 is _ _ _ _ _ _, and the antonym of 5 is _ _ _ _ _ _ _ _.
10. Workers in groups A, B and C, 4 in group A and 5 in group B; Group B needs four people to do the work, and Group C needs seven people to complete it. A project needs a group 13 people and a group 12 people to complete within 3 days. How many days will it take if it is done by 10 people in Group C?
1 1.A and B start from A and B respectively, heading in opposite directions. At the time of departure, the speed ratio of A and B is 5:4. After meeting, the speed of A decreases by 20% and the speed of B increases by 20%. Then when A arrives at B, B is still 10 km away from A, so how many kilometers are A and B apart?
12. Party A and Party B make the same parts, and each person can make one part every 3 minutes. A takes a break of 2 minutes for every 2 parts produced, and B takes a break of 1 minute for every 3 parts produced ... Now they have to finish the task of manufacturing 202 parts together. How many minutes will it take at least?
Xiaoshengchu Mathematics Test Paper Answer (20 1 1):
1，208 2，324 3，A 4，4，4； 16 5、247 6、36
7、4 1 8、5 9、6; 2; 4 10, 14 and113/1601,45012,366.
I hope it works.