How many inches is a 5.8 cm long and 9.6 cm wide mobile phone?

How many inches is a 5.8 cm long and 9.6 cm wide mobile phone?

The size of the screen is the length of the diagonal line of the display screen, and is in inches;
About 4.4 inches;
√（5.8²+9.6²）/2.54
1 inch = 2.54cm;
Hope to help you,

Xiao Hua read a story book. On the first day, he read one eighth of the whole book and 21 pages more. On the second day, he read the remaining four quarters and 172 pages more. How many pages is the story book?

This mention should be wrong ~ can't calculate the whole number~

The difference between the quadratic power of the polynomial 2A - 3AB + 4B and the quadratic power of the polynomial a + ab-b is. Only the result

2 [(a-b) square AB]

The distance between a and B is 800 km. A bus is going from a to B at the speed of 90 km per hour, and a car is going from a to B at the speed of 120 km per hour
Three hours later, how many kilometers is the distance between the two vehicles?,

800-（90+120）x3
=800-210x3
=800-630
=170 km
A: three hours later, the two cars are 170 kilometers apart

|-5 | can be understood as the number axis______ It's the right time______ The distance between them

|-5 | can be understood as the distance from the point of - 5 on the number axis to the origin

It takes 12 hours for a bus to go from city a to city B, and 15 hours for a truck to go from city B to city A. the two cars leave each other at the same time. When they meet, the bus is 180 kilometers away from city B. how many kilometers is the distance between the two cities?

A: the distance between the two cities is 405 km

A is a rational number which is not 1. We call 1 / 2 of (1-A) the difference reciprocal of A
For example, the reciprocal difference of 3 is 1 / 2 of (1-3) = - 1 / 2, the reciprocal difference of - 1 is 1 - (- 1), equal to 1 / 2, A1 = 2, A2 is the reciprocal difference of A1, A3 is the reciprocal difference of A2, A4 is the reciprocal difference of A3 And so on, A2012=
The answer is not important, the key is a simple method, please tell me in detail

a1=2
a2= -1
A3 = 1 / 2
a4=2=a1
So, it's a periodic law with a period of 3!
2012÷3=670…… two
So, A2012 = A2 = - 1

Parachutists perform low altitude parachute jumping. The helicopter hovers at a certain height above the ground, and the athletes leave the plane for free fall. When the parachute is 125m above the ground, the athletes open the parachute, and after the parachute is unfolded, the athletes decelerate in the vertical direction with an acceleration of 14.3m/s2. For the safety of the athletes, the landing speed of the athletes is required to be 5m / S. (1) the athletes leave the plane What is the height from the ground? (2) How long does it take to get to the ground after leaving the plane?

(1) After opening the parachute, the athletes do even deceleration movement. According to the data of v22-v12 = 2as2, the speed of opening the parachute is V1 = 60 & nbsp; m / s, the free fall distance is H1 = v12g = 360020m = 180 & nbsp; m, and the height from the ground when the athletes leave the plane is h = H1 + H2 = 180 + 125m = 305 & nbsp; M. (2) the time of free fall movement is T1 = v1g = 6010 = 6 & nbsp; s. After opening the umbrella, the movement time is T2 = V2 − V1a = 5 − 60 − 14.3 = 3.85s, after leaving the plane, the movement time is t = T1 + T2 = 6 + 3.85s = 9.85s. A: (1) the height of the athlete from the ground when leaving the plane is 305m; (2) after leaving the plane, it takes 9.85s to reach the ground

5. Set up equations and solve them. (1) three times of a certain number is equal to the number plus 12 to find the number

3x=12+x

The maximum static friction is equal to the sliding friction
Every time this sentence appears in the title,

It means that when an object changes from a static state to a critical state of motion, the force used is the same!
In fact, the maximum static friction is slightly greater than the sliding friction! For the convenience of calculation, the topic is regarded as equal!