5x+5/8 -4=7x+1/11

5x+5/8 -4=7x+1/11

5x-7x=1/11-5/8+4
-2x=3/41/88
x=-1/129/176

7x-9x+5X=7.8

7X-9X+5X=7.8
-2X+5X=7.8
3X=7.8
X=2.6

How to calculate 5x-5 / 6 = 5 / 8:2 / 7
If you want to calculate the process, you'd better explain the reason for this calculation

5x-5/6=5/8:2/7
5x-5/6=5/8*7/2
5x-5/6=35/16
5x=35/16+5/6
5x=145/48
x=145/48÷5
x=29/48

On the map with a scale of 1:4000000, the distance between a and B is 20cm,
It is known that the speed of passenger cars is 75 kilometers per hour, and the speed ratio of passenger cars and freight cars is 15:17. How many hours do the two cars meet?

Distance on the graph: actual distance = 1:4000000
Distance = 20 cm
Actual distance = 8000000cm = 800km
Bus speed: truck speed = 15:17
Bus speed = 75 km / h
Freight car speed = 17 × 75 ÷ / 15 = 85 km / h
800 ÷ (75 + 85) = 5 hours
The two cars meet in five hours

Given that the module of a = root 2, the module of B = 3, the angle between a and B is 45 degrees, the value range of X is obtained when the angle between a + XB and XA + B is obtuse

First of all, you need to assume a datum axis, that is, the coordinate X axis (but it is repeated with the X in the title, so the X in the title is replaced by m below). Now, take a as an example, B = 3 / Geng 2 * x + 3 / Geng 2 * y; a = Geng 2; when a + MB and am + B are blunt angles, the product of the two is negative, so (a square + b square) * m + AB * (m square + 1)

The ratio of class A and class B is 8:7, and the ratio of class A and class B is 4:5 when class A transfers 8 people to class B?

If there are x people in class A, there are 7 / 8 * x people in class B;
The equation is as follows
(x-8)/(7/8*x+8)=4/5
solve equations
We can get x = 48 7 / / 8 * x = 42
A: there are 48 in class A and 42 in class B

In 1 × 2 × 3 × 4 How many zeros are there at the end of the product of × 999 × 1000 natural numbers?

The number of B speed 5 determines the number of consecutive 0 at the end
1000÷5=200
1000÷25=40
1000÷125=8
1000 △ 625 = 1 (rounded)
200+40+8+1=249
In 1 × 2 × 3 × 4 There are 249 zeros at the end of the product of 999 × 1000 natural numbers

A car from a city to B city, 45 kilometers per hour, 4 hours to arrive. Back speed increased by 20%, need to be improved

45 * 4 / 45 * (1 + 20%) results in 3 hours and 20 minutes

It is known that in △ ABC, the degree ratio of angle a to angle B is 5:7, and angle B is 10 ° larger than angle A. it should be noted that the degree ratio of angle a to angle B is 5:7

Let angle a be 5x, angle B be 7x, 7x-5x = 10 ° x = 5 °, 5x = 25 ° and 7x = 35 °

Uncle Wang drove from Beijing to Shanghai. From the beginning, his speed was 19 times faster than the original plan. As a result, he arrived one and a half hours earlier. When he returned, he drove at the original plan speed of 280 kilometers and increased his speed by 16, so he arrived in Beijing one hour and 40 minutes earlier. What's the distance between Beijing and Shanghai______ Kilometers

The ratio of the original speed to the speed increased by 19 hours than the original plan is 1: (1 + 19) = 9:10, so the time ratio is 10:9, so 110 is used more than the original plan. The original plan time is: 1.5 △ 110 = 15 hours; 1 hour 40 minutes = 53 hours, then the later period time ratio is: (1 + 16): 1 = 7:6, and the expected time of the later period is 53 × 7 = 353 (hours); so the car speed is: 280 △ 15-353, = 280 △ 103, = 84 (km / h); the whole journey is: 15 × 84 = 1260 (km); answer: the distance between Beijing and Shanghai is 1260 km. So the answer is: 1260