I. Mathematical symbols
1, the invention and use of mathematical symbols are later than numbers, but their number exceeds numbers.
There are more than 200 commonly used mathematical symbols, each of which has an interesting experience.
Second, the operation symbol
1, such as plus sign (+), minus sign (-), multiplication sign (× or), division sign (÷ or/), union of two sets (∩), intersection (∩), root sign (√), logarithm (.
Third, the symbol of nature.
1, such as plus sign "+",minus sign "-",plus sign (and corresponding minus sign).
Four. ellipsis
1, such as triangle (△), right triangle (Rt△), sine (sin) (see trigonometric function).
2. hyperbolic sine function (sinh), function of x (f(x)), limit (lim), angle (∞).
The meaning of mathematical symbols
Symbol: meaning
|x|: the absolute value of the function
The square root of I: 1
F(x): the value of the function f at the independent variable X.
Sin(x): the sine function value at the independent variable X.
Cosx: the value of cosine function at independent variable X.
Tanx: Its value is equal to sinx/cosx.
Cotx: cotangent function or the value of cosx/sinx.
Chinese composition topic of Dezhou senior high school entrance examination in Shandong Province in 2020
It is understood that in 2020, the composition topic of the senior high school entrance examination in Dezhou, Shandong Province has been announced. Bian Xiao has sorted out the composition topics for everyone in the past three years. You can refer to the following to understand the relevant content.
Ln(x): natural logarithm
Lg(x): logarithm with base 2.
Log(x): common logarithm
Floor(x): Integer function over
Ceil(x): lower integer function
X: mod: y: find the remainder
{x}: decimal part: x:-:floor (x)
∫f(x)δx: indefinite integral
∫ [a: b] f (x) Δ x: the definite integral from a to b.
[P]:P]: If p is true, it is equal to 1, otherwise it is equal to 0.
∑[ 1≤k≤n]f(k): Sum n can be extended to many cases.
Such as: ∑ [n: is: prime] [n:
∑∑[ 1≤i≤j≤n]n^2
lim:f(x):(x->； ? ): Find the limit
F (z): M-order derivative function of f about z
C(n:m): number of combinations, where m is taken from n.
P(n:m): the number of permutations.
M | n: m is divisible by n.
M ⊥ n: m and n are coprime
A: ∈: A: A belongs to set A.
#A: the number of elements in set a.