How much is 15.5? How to divide 15.5 by 10

How much is 15.5? How to divide 15.5 by 10

15.5=155/10
15.5/10=1.55
Move the decimal point one place to the left, which means that the number will be reduced by 10 times

Given that the vector a = (2, - 3,5) is collinear with the vector b = (3, λ, 15 / 2), what is λ equal to?

If two vectors are collinear, one vector can be used to represent the other
Example: a = α B (α is a constant)
In other words, the point coordinate ratio of two vectors is the same
a=(2,-3,5),b=(3,λ,15/2)
2/3=-3/λ=5/(15/2)
It can be concluded that λ = - 9 / 2

Who can tell me what these formulas are equal to?
Sin ("alpha PAI)=
Cos ("alpha PAI)=
Tan ("alpha PAI)=

Sin ("alpha PAI) = - Sina
Cos ("alpha PAI) = cosa
Tan ("alpha PAI) = - Tana

What is the formula for Excel to input the current date and time in the form?

You can use the function: = now () to input the current date and time in the cell you want to display. You can also directly click the key combination: Ctrl + in the selected cell to display the current date