How many grams or kilograms is 0.5 grams per square centimeter converted into per square meter?

How many grams or kilograms is 0.5 grams per square centimeter converted into per square meter?

It's 5000 grams per square meter, or 5 kilograms

2 / 7 times 1 / 4 minus 3 / 4 divided by 7 / 2 (simple operation)

2/7X1/4-3/4÷7/2
＝2/7x1/4-3/4x2/7
=2/7x(1/4-3/4)
=2/7x-1/2
=-1/7

When a train passes a 400 meter long bridge, it takes 12 seconds from starting to get on the bridge to completely leaving the bridge, and the time for the train to be completely on the bridge is 8 seconds. How to find the length of the train,

Let the train length be x meters, then (400 + x) / 12 = (400-x) / 82 (400 + x) = 3 (400-x) 800 + 2x = 1200-3x
5x=400 x=80m

More than 10 exercises of linear equation of one variable
Come on, it's urgent!

1、 Judgment questions: (1) judge whether the following equation is a linear equation of one variable: ① - 3x-6x2 = 7; () ② ③ 5x + 1-2x = 3x-2; () ④ 3y-4 = 2Y + 1. () (2) judge whether the solution of the following equation is correct: ① solve equation 3y-4 = y + 3, 3y-y = 3 + 4, 2Y = 7, y =; () ② solution: 0.4x-3

The distance between a and B is 18km, and that between B and C is 27km. It takes 0.5h for the car to travel from a to B and from B to a
The distance between Party A and Party B is 18km, and that between Party B and Party C is 27km. It takes 0.5h for a car to go from place a to place B and from place B to place A. Q. (1) the average speed of a car from place a to place B? (2) the average speed of a car from place B to place C? (3) the average speed of a car from place a to place C?
How to find the time from B to C?

1.v1=s1/t=18/0.5 km/h=36km/h
2.v2=s2/t=27/0.5 km/h=54km/h
3.v3=(v1+v2)/2=45km/h

Given the square of a - AB = 1, the square of 4ab-3b = - 2, find the square of a + the square of 7ab-6b =?
Come on,

Square of 4ab-3b = - 2
The two sides of the formula multiply by two
8ab-6b^2=-4
The square of a - AB = 1 minus the above formula
a^2-ab-(8ab-6b^2)=1+4
a^2-9ab+6b^2-5=0

If you take 7.5kg apples from the first box and put them into the second box, they are the same weight. How much are they?

Let the weight of the second box be x, and the weight of the first box be 4x. Then, according to the meaning of the question, 4x-7.5 = x + 7.5, we get x = 5, then the first box is 20kg, and the second box is 5kg

Given 10 ^ a = 2,10 ^ B = 5,10 ^ C = 3, find the value of 10 ^ 3a-2b + C

10^3a-2b+c
=[(10^a)³ x 10^c]/(10^b)²
= (2³ x 3)/25
=24/25

There are 620kg apples and pears in the fruit supermarket. Four fifths of the weight of apples is as much as three fourths of the weight of pears. How many kilograms are apples less than pears
Explain the source of the formula

Apple: pear = 3 / 4:4 / 5 = 15:16
Apple = 620 × 15 / (15 + 16) = 300 (kg)
Pear = 620 × 16 / (15 + 16) = 320 (kg)
320-300 = 20 (kg)
Apples are 20kg less than pears

How many faces are there for pentagons and hexagons? How many vertices are there? How many edges are there? Guess the situation of heptagonium and try to verify your guess

Wuleng: 7.10.15
Six ridges: 8.12.18