The reciprocal of non-zero natural numbers is smaller than 1______ ．

The reciprocal of non-zero natural numbers is smaller than 1______ ．

The reciprocal of 1 is equal to 1 itself, so it is wrong to say that the reciprocal of non-zero natural number is smaller than 1

The following statement is correct ()
A. A natural number is a nonnegative integer B. a number is either positive or negative C. an integer is a natural number D. both positive and negative numbers are called rational numbers

A. Natural numbers are non negative integers, so a is correct; B, a number is not positive, maybe zero or negative, so B is wrong; C, integers are numbers with denominator 1, so C is wrong; D, integers and fractions are collectively called rational numbers, so D is wrong; so a

How to solve N (n-3) / 2 = 3N?

When n is equal to 0, the formula left = right = 0 holds
When n is not equal to 0, divide both ends by N at the same time to get (n-3) / 2 = 3, and the solution is n = 9
So, n = 0 or 9

How fast is the highest running speed of cheetah?

The cheetah can be said to be the world's "sprint champion". Scientists have repeatedly observed and calculated in the field, and found that the speed of the cheetah in pursuit of its favorite antelope can reach 113 kilometers per hour, which is faster than the famous Indian antelope. Deer, steeds and hounds are far behind. However, in long-distance running, the speed is much slower, with an average speed of about 60 kilometers per hour, The speed of an African ostrich

How to solve the equation with two unknowns
For example, 2x + 3Y = 100

The solution of the equation with two unknowns is not fixed
A series of group solutions are obtained
Generally, when we need to get a fixed solution, we need several equations with several unknowns

How long does it take for an airplane to fly 1000 kilometers per hour from the earth to the moon?

The average distance between the earth and the moon is 380000 km, so 380000 / 1000 = 380 hours = 15.9 days

10 equals x minus X
Type a word
To know is to be firm

10 = x-circuit, x = 10 + circuit, that is x = ten + circuit, ten + circuit is solid

What are the factors related to the friction force and the materials to be prepared

If it is a static friction force, the friction force is equal to the pull force on the same line, but the direction is opposite
2. If it is dynamic friction, it is related to the pressure of vertical friction and dynamic friction coefficient

The ratio of the sum of X and 3 to 4 is 1.2 to 0.6

(x+3)/4=1.2/0.6
x+3=8
x=5

The two cities are several kilometers apart. A passenger train and a freight train leave the two cities at the same time. They meet three hours later. When they meet, the passenger train travels 60 kilometers more than the freight train. It is known that the speed ratio of the freight train to the passenger train is 9:11. How many kilometers does the freight train travel per hour on average? Give it to me in five minutes,

Passenger cars travel more than freight cars per hour: 60 △ 3 = 20 (km)
The average speed of freight cars per hour: 20 ÷ (11-9) × 9 = 90 (km)