Is o an integer or a natural number? The denominator of a fraction must be an integer

Is o an integer or a natural number? The denominator of a fraction must be an integer

0 is an integer and a natural number, because natural numbers include 0 and positive integers
The denominator of a fraction is not necessarily an integer. For example, 2.4/3.5 is also a fraction, but the numerator denominator is not an integer. Of course, 2.4/3.5 cannot be the simplest fraction, and the numerator denominator of the simplest fraction must be an integer

What are constants, natural numbers, real numbers, integers, etc. in mathematics
Within what scope. What kind of number is it

Constant is a fixed number, for example: π (PI) natural number is 0 and positive integer, for example: 0,1,2,3,4,5,6,7,8,9 The classification of real numbers (1) real numbers include rational numbers and irrational numbers. Irrational numbers are infinite acyclic decimals (e.g. π) and numbers with open roots (e.g. 2 under the root)

What's the difference between unit "1" in mathematics and natural number 1

1 are abstract, abstract out of the same; used in different environments to "specific problems, specific analysis."

The bracket minus four fifths times ten minus one and one fourth plus Zero Zero Zero Five

（-4/5）*10-5/4+0.05
=-8—（1.25+0.05）
=-8—1.3
=-6.7

The speed of the bus is 55 kilometers per hour, which is equivalent to 11 / 40 of the speed of the train after the speed increase. How many kilometers per hour is the speed of the train after the speed increase
The speed of the bus is 55 km / h, which is 20% slower than that of the train after the speed increase. How many km / h is the speed of the train after the speed increase? A barrel of oil weighs 27 kg after 20% is used, and 18 kg after half is used. How many kg is the barrel of oil? In ten minutes, use the equation, the equation! The equation!

The speed of the bus is 55 km / h, 20 times slower than that of the train after the speed increase. How many km / h is the speed of the train after the speed increase?
55÷（1-20/40）
=55÷1/2
=110 km / h
A barrel of oil weighs 27 kg after 20% is used, and 18 kg after half is used. How many kg is this barrel of oil?
（27-18）÷（1/2-20%）
=9÷0.3
=30 kg

If (m-1) x ^ M2y is a binomial of X, y, then what is m = and what is its coefficient?

Because (m-1) x ^ M2y is a binomial of X, y
So m ^ 2 = 1, M = ± 1
① When m = 1, M-1 = 0 (rounding off)
② When m = - 1, M-1 ≠ 0
So m = - 1

Some tons of cement were transported into a construction site, which accounted for 1 / 3 of the total amount. Later, 12 tons were transported in, and now 4 / 9 of the total amount was used,

There is something wrong with your problem. After 12 tons are transported in, 1 / 3

If O is the outer center of △ ABC, then ∠ BOC=______ If O is the inner part of △ ABC, then ∠ BOC=______ Degree

As shown in Figure 1, point O is the outer center of the triangle. According to the circle angle theorem, it is obtained that ∠ BOC = 2 ∠ a = 140 °; as shown in Figure 2, point O is the inner center of the triangle. Bo and co bisect ∠ ABC and ∠ ACB, and ∠ BOC = 180 ° - (∠ OBC + ∠ OCB) = 180 ° - 12 (∠ ABC + ∠ ACB) = 180 ° - 12 (180 ° - a) = 90 ° + 12

When 2 tons of yellow sand are transported from construction sites, two fifths of it will be used on the first day, and one fourth of it will be used on the second day?

13 out of 20

Given the functions f (x) = ax ^ 2 + ax and G (x) = x-a, where a belongs to R and a is not equal to 0. (1) if a common point of the image of the functions f (x) and G (x) is exactly on the x-axis, find the value of a; (2) if P and Q are two of the equations f (x) - G (x) = 0 and satisfy 0

Solution, 1, the common point is exactly on the X axis, that is, ax ^ 2 + AX = 0 and x-a = 0,
X = 0 and x = - 1, so a = 0, a = - 1