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gre数学考试常用符号详细解析.

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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

therore

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

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