What is the value of the expression 9! = 10?

What is the value of the expression 9! = 10?

1 or true

3,4,5,6,7,8,9,10,11,12,13. What's the rule, expressed by formula

It's N + 2 (n is a positive integer)

5 / 8 divided by (1 / 2 plus 1 / 4) (formula)

2) Among the natural numbers from 1 to 1000, there are () numbers without 1 at all
2) Among the natural numbers from 1 to 1000, there are () numbers without 1 at all

899 +89+8=996

There are signs everywhere on the freeway to remind drivers to keep a reasonable distance. A Santana car runs at 108km / h on the freeway

Yes, we should keep a distance on the highway to prevent the car in front of us from crashing when there is something wrong with the car. This is for the sake of safety

The minute hand on the clock face turns 360 degrees, and the corresponding hour hand turns (how many) degrees
Do you know

360/12=30

The total length of Lu Ning expressway is 274 kilometers. A bus starts from Shanghai and runs at 95 kilometers per hour. After a period of time, it is 84 kilometers away from Nanjing

(274-84) + 95 = 190 + 95 = 2 (hours)

Given a ^ 2n = 2, find the value of (2a ^ 3n) ^ 2-6a ^ 2n + 1 times (- 5A ^ 2n-1)

(2a^3n)^2-6a^(2n+1)*(-5a^(2n-1))
=4a^6n-6*(-5)*a^(2n+1+2n-1)
=4(a^2n)^3+30(a^2n)^2
=4*2^3+30*2^2
=32+120
=152

The train route of a and B is 40 kilometers longer than that of a car. The car starts from a place first, and the speed is 40 kilometers per hour. Half an hour later, the train starts from a place, and the speed is 60 kilometers per hour. As a result, the car arrives at B place only one hour later than the train. How long is the bus route of a and B?

cscwt ,
The bus route between the two places is x km long
（X＋40）÷60＝X÷40－0.5－1
（X＋40）÷60＝X÷40－1.5
2X＋80＝3X－180
X＝180＋80
X＝260
A: the bus routes between a and B are 260 kilometers long

When a=___ The algebraic expression X & sup2; - 3axy-3y & sup2; + 1 / 3xy-8 about X, y does not contain XY term

x²-3axy-3y²+1/3xy-8
=x²-3y²+（1/3-3a）xy-8
Without XY term
be
1/3-3a=0
So a = 1 / 9