It takes Xiaogang 4 minutes, Xiaoming 6 minutes and Xiaojuan 8 minutes to run a circle along the track. How many minutes will we meet at the starting point

It takes Xiaogang 4 minutes, Xiaoming 6 minutes and Xiaojuan 8 minutes to run a circle along the track. How many minutes will we meet at the starting point

Finding the least common multiple of 4 6 8
It's 24 minutes

According to the survey, the clothing sold by individual clothing stores can be profitable as long as the price is higher than 20% of the purchase price, but the owners often price the clothing 50% - 100% higher than the purchase price. If you are going to buy a clothing with a price of 300 yuan, you should______ ～______ Within the range of RMB?

Let the purchase price be x yuan. When it is 50% higher than the purchase price, (1 + 50%) x = 300, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 200; when it is 100% higher than the purchase price, (1 + 100%) x = 300, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2x = 300, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 2x = 300; X = 150; 200 × (1 + 20%) = 240 yuan, 150 × (1 + 20%) = 180 yuan; a: the counter-offer range is 180 yuan to 240 yuan

As shown in the figure, two points a and B are on the number axis, and the corresponding number of point a is 2. If the length of line AB is 3, the corresponding number of point B is ()
A. -1B. -2C. -3D. -4

According to the number axis, we can see that B ＜ 0, a ＞ 0, and the number corresponding to B point is 2-3 = - 1

Measure the distance between AB on the other side of the river, unconditionally
If there is no condition, the other side of the river is inaccessible. The AB distance should be calculated. Write out the formula for ab distance

It is easy to get the result by using the similar triangle. Take the river bank as the horizontal reference line (for convenience, assume it is straight), and observe at a point (such as m point) on the straight line passing through point a and perpendicular to the bank. Two points M1 and M2 can be made on the bank, so that M1 is on am and M2 is on BM. Then, the observation point can be connected with

Mathematical problems (addition and subtraction of integers) (valid before 21:30 on November 21)
1、 Simplification
（1）a²-（ab-b²）-b²；
（2）（x²-y²）-3（2x²-3y²）；
（3）7a²b-（-4a²b+5ab²）-2（2a²b-3ab²）
2、 Remove the brackets before merging the same items
(1) (x-1)-(2x+1)
(2）3（x-2）+2（1-2x）
（3）2（2b-3a）+3（2a-3b）
（4）（3x²-xy-2y²）-2（x²+xy-2y²）
3、 First simplify, then evaluate
(1) 3x & sup2; + (2x & sup2; - 3x) - (- x + 5x & sup2;), where x = 314;
(2) (5xy-8x & sup2;) - (- 12x & sup2; + 4xy), where x = - & frac12;, y = 2
The first question of the first question is wrong
Should be:
a²-2（ab-b²）-b²

A granary with a volume of 5000 cubic meters, the mass of rice is 72g, the volume is 60 cubic centimeters, and the density is 1.2g/cm cubic meters___ Kg of rice

6000000

The passenger car and the freight car run from a and B at the same time, and meet at a distance of 6 km from the midpoint. It is known that the speed of the freight car is 45 times that of the passenger car. How many kilometers are there between a and B?

A: the distance between a and B is 108 km

Let X be greater than 1. Compare the sizes of x cube and x square - x + 1,

It is used as the difference method;
x^3-X^2+X-1=x^2(x-1)+x-1=（x-1）（x^2+1）
x＞1 ∴x-1＞0
x^2+1＞0
The original formula is more than 0
So x ^ 3 ＞ x ^ 2-x + 1 (x ＞ 1)

X-（1/5X+1/5X-15）=3/5X+15

X-（1/5X+1/5X-15）=3/5X+15;
3x/5+15=3x/5+15;
So it's an identity, so x can be any real number
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The height of a cylinder is 15 cm. Increase its height by 2 cm and then increase its surface area by 25.12 cm

The circumference of the bottom surface of the cylinder: 25.12 △ 2 = 12.56 (CM), the radius of the bottom surface: 12.56 △ 3.14 △ 2 = 2 (CM), the volume: 3.14 × 22 × 15, = 3.14 × 4 × 15, = 188.4 (cm3); answer: the original volume of the cylinder is 188.4 cm3