1.常用数学知识

1.常用数学知识

常见符号

＋ plus;positive

－ minus;negative

× multiplied by;times

÷ divided by

＝ equals

≈ approximately equals

≠ not equal to

＜ less than

＞ greater than

≤ equal to or less than

≥ equal to or greater than

() round brackets;parentheses

[] square brackets

{} braces

∈ is a member of the set

⊂ is a subset of

∽ similar to

≌ congruent to

* denotes an operation

∴ therefore

∵ because

∶ ratio sign,divided by,is to

∷ equals,as(proportion)

square root of

cube root of

∥ parallel to

perpendicular to,at right angles

⊥ with

∠ angle

∟ right angle

º degree

′ minute

″ second

⊙ circle

A⁀B arc AB

the base of natural

elogarithms,approx.2.71828

x!factorial x,x(x-1)(x-2)---1

log_nx log x to the base n

π pi

log x to the base e(natural

lnxlogarithm)

log x to the base 10(common

lgx logarithm)

|x| the absolute value of x

常见几何计算公式

平面图形的周长和面积

立体图形的表面积和体积

SSAT数学知识点分布