Column: 10000-0 (absolutely safe) 7 divided by 2 (no three no four) Q: eight out of seven ()

Column: 10000-0 (absolutely safe) 7 divided by 2 (no three no four) Q: eight out of seven ()

Seven out of eight, right? Seven up and eight down

Fill in the blanks as you like 1000-0 divide 7 by 2 ()

7 divided by 2 (no three no four)

Move the decimal point of 5.09 two places to the left to get the number______ Compared with the original number______ It's over______ Times

Move the decimal point of 5.09 two places to the left, and the number is 509, which is larger than the original number: 509 △ 5.09 = 100 (Times); so the answer is: 509, expand, 100

The distance between the two places is 900 km. A and B trains set out at the same time and run in opposite directions. Car a runs 60 km per hour, and car B runs 90 km per hour. When the two trains meet on the way, they meet
Keep going. How long does it take for the two cars to reach each other's starting point from the moment they meet

Encounter time = 900 ÷ (60 + 90) = 6 hours
For a, it will take 9 hours = 900 △ 60-6
B = 900 △ 90-6 = 4 hours

It is known that a and B are positive numbers, ab = 4, which means that the minimum value of the arithmetic square root of (a + b) is 2

(a+b)²=a²+b²+2ab》4ab=16,
So a + B 4
So a + B arithmetic square root

The two trains run from the two cities at the same time. When they meet, train a runs 300 kilometers and train B runs 360 kilometers. The speed of train a is per hour
120 km per hour, find the speed of train B

The speed of B is that of a: 360 △ 300 = 6 / 5
B speed: 120 × 6 / 5 = 144 km / h

For sub data 3, 6, 4, 6, 3, 10, 2, 5, 6, mode is 6, average is 5, median is 3______ ．

(1) Mode: in this group of data, the most frequent occurrence is 6, so the mode is 6; (2) average: (2 + 3 + 3 + 4 + 5 + 6 + 6 + 6 + 10) △ 9, = 45 △ 9, = 5; (3) median: the 9 data are arranged in the order from small to large: 2, 3, 3, 4, 5, 6, 6, 6, 10, the number of data is 9, which is odd, and the number in the middle is 5, so the median of this group of data is 5; A: the mode of the data is 6, the median is 5, and the average is 5

The sum of 25 consecutive even numbers is 2000. What is the largest even number?
How do you know the one in the middle is 80?

Simple.104
2000 / 25 = 80, get the even number in the middle
Another 80 + 12 × 2 = 104 is the answer

Choose four numbers from the factors of 24 to make up the proportion

The factors of 24 are (1,2,3,4,6,8,12,24)
1：2=3：6
2：3=8：12
4：2=12：6
……

On the freeway, if a car with a length of 4 meters and a speed of 110 km / h is ready to overtake a truck with a length of 12 meters and a speed of 100 km / h, it will take about ()
A. 1.6 seconds B. 4.32 seconds C. 5.76 seconds D. 345.6 seconds

Suppose that the required time is x seconds, 110 km / h = 2759 M / s, 100 km / h = 2509 M / s. according to the distance that the car takes is equal to the distance that the truck takes plus the body length of the two cars, the solution is: 2759x − 2509x = 12 + 4, x = 5.76, so choose C