Are there negative numbers in natural numbers

Are there negative numbers in natural numbers

What is the definition of university
Natural number: ≥ 0 integer

Is 0 a natural number or a negative number?

Natural numbers include prime numbers and composite numbers, so zero is not a natural number

33000 CC =? L
Please write the number of times or divided by and the answer

1000 CC = 1 cubic decimeter = 1 liter
So: 33000 CC = 33 liters

One year later, it was found that the growth value of the average height of group B was 2.01cm more than that of group A, and the growth value of the average height of group A was 0.34cm less than that of group B The growth value of the average height of the two groups of students

According to the meaning of the question: 34 (x + 2.01) - x = 0.34, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 34x + 1.5075 = 0.34, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp

1 23 4 5 6 78 9 = 0, fill in different symbols to make the formula true

(1 + 2 - 3) * (4 + 5 + 6 + 7 + 8 + 9) = 0 (* is a multiplication sign)

If the root sign X-1 minus the square of the sum of the root signs 1-x = x + y, then the value of X-Y is__________

From X-1 > = 0,1-x > = 0: x = 1
So x + y = 0
y=-1
x-y=2

Mathematics Grade 7 Volume 2 vertical judgment questions
If two lines are perpendicular to each other, then all adjacent complements are equal. A line cannot be perpendicular to two intersecting lines. If three of the four corners formed by the intersection of two lines are equal, then the two lines are perpendicular to each other. If two lines intersect with a set of complementary vertex angles, then the two lines are perpendicular to each other; ）Right and wrong, please say the reason, more specific, thank you

Because vertical, can get 90 ° angle, so ① correct; according to the plane, through a point, there is and only one straight line and known straight line vertical, can know ② correct; two straight lines intersect into four angles, as long as can get an angle of 90 degrees, then can prove vertical, ③ known three angles are equal, using the opposite vertex angle equal and adjacent complementary angle mutual

11 and 33 greatest common factor and least common multiple

11

Ask for an English composition about the advantages and disadvantages of listening to music in spare time, about 100 words
rt!

　　Music seems to be a natural need for people.I've read that from ancient times human beings have produced sounds from "instruments" like rocks or skins stretched over a wooden frame.Music is someth...

Answers to unit 2 of Mathematics Standard test paper for Grade 6 Volume 2 of Jiangsu Edition

kan b a
850m & sup3; decimeter 3.6L
three hundred and twenty
2 times 50.24
0.5625 25.12
thirty-seven point six eight
twenty-four
9 meters
90cm
235.5 cm3
two hundred and twenty-two
two thousand five hundred and twelve
nine thousand four hundred and twenty
Tick ×××
D
B
B
D
C
twenty-eight point two six
nine point four two
forty-eight
sixty-four
four
thirty-seven point six eight
ninety-two point four
four hundred
seventy-five
thirty-one point four
two
nine hundred and seventy-nine point six eight
two thousand two hundred and sixty point eight
I want to add points, I answered all
I want to add 20, OK, not much, my hard work