Chapter 2: all the answers to rational numbers and their operations^_ ~^^,^^~^@&>(/[

Chapter 2: all the answers to rational numbers and their operations^_ ~^^,^^~^@&>(/[

I am also a seventh grade student, you say the topic I can help you, my performance is also very good, in the class is the monitor, you have to refuel, I will teach you, but you can't exceed, this is not good for you!

It's in the newspaper,
It is known that a multiplied by 7 / 9 = B multiplied by 8 / 7 = 7 / 7 multiplied by C, where a, B and C are nonzero natural numbers

You can turn them all into integers to find the common multiple B C a of the denominator

Mathematics problems in Grade 6 newspapers
How many kilometers is the distance between a and B?

If x hours are used for the go time, then (9-x) hours are used for the return time
80x=(9-x)×100
80x=900-100x
80x+100x=900
x=900÷180
x=5
Distance between a and B: 80 × 5 = 400 km

Calculate the relative elevation and absolute elevation of the base
In this project, ± 0.000 m is relative to the absolute elevation of 5.580 m, the top elevation of the foundation is -4.200 m, and the thickness of the raft foundation is 0.8 M. how to calculate the relative elevation of the base? The absolute elevation?

Relative elevation of basement: - 4.2-0.8 = - 5.0m
Absolute elevation of basement: - 5.0 + 5.58 = 0.58M

Can infinity be regarded as limit in higher numbers?

Can infinity be regarded as limit in higher numbers

Solve equation 7 by (4.5 minus x) = 17.50.65 + 6x = 13.432.5 divided by (x minus 0.5) = 25%

1. 7 (4.5-x) = 17.5 remove bracket to get: 31.5-7x = 17.5 transfer term to get: - 7x = 17.5-31.5-7x = - 14 solution to get: x = 22,0.65 + 6x = 13.43 transfer term to get: 6x = 13.43-0.656x = 12.78 solution to get: x = 2.133,2.5 / (x-0.5) = 25% 2.5 / (x-0.5) = 1 / 4 (25% = 1

This is a problem in the relationship of quantity!

Root 126 and triploid root 14 are equal

How to solve (3x-1) = (3-2x)

（3x-1）²-（3-2x）²=0（x+2）（5x-4）=0x1=-2,x2=4/5

Calculate 1 / 6 x + 1 / 12 x + 1 / 7 x + 5 + 1 / 2 x + 4 = X
.
There must be steps. It's not just the answer

Multiply both sides by 84
14X+7X+12X+420+42X+336=84X
2. Move items from both sides and merge similar items
756=9X
3 divided by 9
X=84

How to calculate (9999 * 9999 + 19999) / 1000000 in a simple way?

（9999×9999＋19999）÷1000000
＝（9999×9999＋10000＋9999）÷1000000
＝[9999×（9999＋1）＋10000]÷1000000
＝（9999×10000＋10000）÷1000000
＝10000×（9999＋1）÷1000000
＝10000×10000÷1000000
＝100