gre数学考试常用符号详细解析:
|
＋ |
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 o |
|
( ) |
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 |
|
e |
the base of natural logarithms,approx.2.71828 |
|
x! |
factorial x, x(x-1)(x-2)---1 |
|
lognx |
log x to the base n |
|
π |
pi |
|
lnx |
log x to the base e(natural logarithm) |
|
lgx |
log x to the base 10(common logarithm) |
|
|x| |
the absolute value of x |
