Linear function; y=kx+b

Quadratic function y = ax 2+bx+c

Inverse proportional function; Y=k/x proportional function; Y=kx when b=0.

Exponential function; y=a^x(a>； 0 and not equal to 1)

Logarithmic function; y = loga x loga 1 = o logaa = 1

Not to mention inequality.

Sequence;

Arithmetic series; The tolerance is marked d.

General formula; An(n is low) =a 1+(n+ 1)d

Mid-term; A=a+b/2 (A-a=A-b)

Sum of the first n items; Sn=n(a 1+a2)/2 or Sn=na 1+n(n- 1)d/2.

The comparison of geometric series is written as Q.

General formula; A n is the power of n- 1, and the radix = a1q.

The first n terms and formulas; Sn = a1(n power of1-q)1-q or Sn=a 1-an(n is the radix) q/1-q (q is not equal to 0) It is very important to write down the first n terms and formulas of a series.