Judgment question: 36 / 100 meters can also be written as 36% meters ()

Judgment question: 36 / 100 meters can also be written as 36% meters ()

Of course not~
The percent sign represents a percentage, that is, a few percent. It is not an accurate number, and it can not be followed by a unit~

A pile of sand weighs 50 / 100 tons, which can be written as 50% tons. Right or wrong? I feel strange

Wrong, percentage can't represent a real number

1.8.4 / 2.5 + 8.4 / 7.5 = 8.4 / (2.5 + 7.5) () 2.0.78 increase 100 times is 78 (), please explain

1. Wrong. If the numerator is the same, the denominator cannot be added directly. If the denominator is the same, the numerator can be added directly;
2. Wrong, the 100 times increase of 0.78 is not equal to 0.78 times 100, but equal to 0.78 times 101, so it is not equal to 78

Simple calculation '1 ÷ (2.1-2.05) × 1.5

300

How to calculate 4 (2000-x) - 5x = 800

8000-4x-5x = 800
- 4x - 5x = 800 - 8000
One 9x = one 7200
X = 7200 divided by (9)
x=800

x^2-5x-2000=0
most urgent

X = (5 + root 8025) / 2 or (5-root 8025) / 2
Change to x = (5 + 5 radical 321) / 2 or (5-5 radical 321) / 2

x+3/5x=48
x+3/5x+8=48

5/5x+3/5x=48
8/5x=48
x=30

5x = 2 * 166 + 3 (x + 2) whole process

5X=332+3X+6
5X-3X=6-332
2X=-326
X=-326/2
X=-163

0.5X+2=X-3

0.5X+2=X-3
x-0.5x=2+3
0.5x=5
x=5/0.5
x=10

Find x when 5x-8 > 7

X is greater than 3