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The sum of a and B is 1.98. If the number of a is reduced to one tenth of the original number, then the ratio of a and B is 1:1. What is the original number of a and B?
Let a be x and B be 1.98-x
0.1x=1.98-x
1.1x=1.98
x=1.8
The number a is 1.8 and the number B is 0.18
Xiao Li and Xiao Zhu cooperate to complete a project. Due to good cooperation, Xiao Li's work efficiency is 110 times higher than that when they do it alone, and Xiao Zhu's work efficiency is 15 times higher than that when they do it alone. They cooperate for 6 days to complete the task. If Xiao Li takes 11 days to do it alone, how many days does Xiao Zhu take to do it alone?
The work efficiency of two people's cooperation is: 16 Xiao Li's work efficiency in cooperation is: 111 × (1 + 110) = 110 Xiao Zhu's work efficiency in cooperation is: 16 − 110 = 115 Xiao Zhu's work efficiency in independent work is: 115 ÷ (1 + 15) = 118 Xiao Zhu's work efficiency in independent work is: 1 △ 118 = 18 (days)
A project can be completed in 63 days by Party A alone, and then in 28 days by Party B alone. If it takes 48 days for Party A and Party B to cooperate, how many days will it take for Party A to complete the project in 42 days and then by Party B?
If Party A and Party B work together for 28 days, 28 △ 48 = 712 of the completed task, so Party A's work efficiency is (1-712) / (63-28) = 184, Party B's work efficiency is 148-184 = 1112, so Party B still needs to do (1-184 × 42) / (1112 = 56 days). Answer: it will take 56 days to complete
Xiaohong's family bought a refrigerator when they were promoting in the electrical appliance store. The price of the refrigerator was 20% off, which was 360 yuan cheaper than the original price. How much was the original price of this refrigerator?
There is a wooden house in the middle of a piece of grass. The wooden house covers a square with a side length of 5 meters. A is a corner of the wooden house. There is a stake at point a. a cow is tied to the stake with a 10 meter long rope. How many square meters is the maximum area for the cow to eat grass?
360/0.12=3000
100pai-25
1. There are 80 pages in a book. Pipi has read 3 / 4 of the total pages. Pipi has read 3 / 4 of () pages
2. Porcelain city garden has a semicircle flower bed with a radius of 10 meters
3. There are 30 pens and ballpoint pens in the box, which are worth 145 yuan. Each pen is 9 yuan, and each ballpoint pen is 4 yuan. There are () pens and () ballpoint pens
4. The present price is 10% lower than the original price, which means that (a) the present price accounts for 10% of the original price (b) the original price accounts for 10% of the current price (c) the present price is less than the original price (10%)
5. New year's Day is coming, all the shopping malls are selling at a discount. All the clothes in the people's shopping mall are given a 25% discount. The children's clothing counter in the department store says "60 for 200". Xiaoming's mother wants to buy a set of clothes for Xiaoming with a price of 280 yuan. It's cheaper for her to go to () instead
6. Draw the largest circle in a square with an area of 60 square centimeters. The area of this circle is () square centimeters
7. Cut a cube into two cuboids. The sum of the surface areas of the two cuboids is () larger than that of the original cube
8. The output value of Changzheng chemical fertilizer plant in July is 300000 yuan, which is higher than that in July
9. If a pile of wheat weighs 1800 kg and its flour yield is 75%, it can grind () kg flour
10. If there is a stamp, the inscribed side is a circle with a diameter of 4cm, then the area of the circle is () square centimeter
1. There are 80 pages in a book. Pipi has read 3 / 4 of the total pages. Pipi has read 3 / 4 of (60) pages
80*3/4=60
2. There is a semicircle flower bed in the garden of porcelain city with a radius of 10 meters. Walking around the flower bed will take at least (51.4) meters
The circumference of the semicircle is equal to = 1 / 2 of the circumference of the circle + diameter = 2 * 3.14 * 10 / 2 + 10 * 2 = 31.4 + 20 = 51.4
3. There are 30 pens and ballpoint pens in the box, which are worth 145 yuan in total. Each pen is 9 yuan, and each ballpoint pen is 4 yuan. There are (5) pens and (25) ballpoint pens
Suppose there are x pens, then the ballpoint pen has (30-x)
9X+(30-X)*4=145
9X+120-4X=145
5X=145-120
X=5
30-5=25
4. 10% cheaper than the original price means (c) A. the current price accounts for 10% of the original price; B. the original price accounts for 10% of the current price; C. The current price accounts for 10% less than the original price
5. New year's Day is coming, all the shopping malls are selling at a discount. All the clothes in the people's shopping mall are given a 25% discount. The children's clothing counter in the department store says "60 for 200". Xiaoming's mother wants to buy a set of clothes for Xiaoming with a price of 280 yuan. It's cheaper for her to go to () instead
People's Mall: 280 * 75% = 210
Department store: 280-60 = 220
So the people's Republic of China
6. Draw the largest circle in a square with an area of 60 square centimeters. The area of this circle is (47.1) square centimeters
Square 60 is the side length of a square: 60 under the root
Divide the side length of a square by 2 to get the radius of a circle: 60 under the root sign of 1 / 2 *
The area of a circle is: 3.14 * (60 under 1 / 2 * radical) * (60 under 1 / 2 * radical) = 3.14 * 15 = 47.1
7. Cut a cube into two cuboids. The sum of the surface area of the two cuboids is (33.3)% (one decimal place before the percent sign) larger than that of the original cube
8. The output value of Changzheng chemical fertilizer plant in July is 300000 yuan, which is higher than that in July
30*（1+?）=
9. If a pile of wheat weighs 1800 kg and the flour yield is 75%, the pile of wheat can grind (1350) kg of flour
1800*75%=1800*3/4=1350
10. There is a stamp, and the inscribed side is a circle with a diameter of 4 cm, so the area of the circle is (12.56) square cm
Radius = 4 / 2 = 2 cm
Area = 3.14 * 2 * 2 = 12.56
Sixth grade mathematics development, a little difficult, a little simple. Urgent!
1. Draw the largest element in a rectangle 5 cm long and 4 cm wide, and find the circumference and area of the circle
2. The outer diameter of a bicycle tire is about 0.7 M. if it turns 90 cycles per minute, how far can it go in 40 minutes? How many minutes does it take to cross a 989.1 m bridge? (π = 3)
1. Radius of circle = 4 / 2 = 2 cm
Perimeter = 2 * 2 * 3 = 12 cm
Area = 2 * 2 * 3 = 12 square centimeters
2.40 minutes = 0.7 * 3 * 90 * 40 = 7560m
989.1 / (0.7 * 3 * 90) about = 5.23 minutes
There is a 6-digit number whose one digit number is 6. If the new 6-digit number obtained by moving 6 to the first digit is 4 times of the original number, then the 6-digit number is 6______ ．
Let X be the first five digits of the six digit number, then 600000 + x = (10x + 6) × 4600000 + x = 40x + 24 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 39x = 59976 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 15384. Therefore, the six digit number is 153846
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