SYMBOL MEANING 　　= is equal to
　　≠ is not equal to
　　≈ is approximately equal to
　　＞ is greater than
　　≥ is greater than or equal to
　　＜ is less than
　　≤ is less than or equal to
　　根号 square root
　　0.888888… the repeating decimal
　　r s't"  r degrees s minutes t seconds
　　∠angle
　　∟ right angle
　　┻ is perpendicular
　　│x│ absolute value of x
　　∥ is parallel to
　　△ triangle
　　～ is similar to
　　≌ is congruent to
　　△x delta x
　　π pi(3.1415…)
　　1. is equal to; is the same as
　　  the result is; yields; gives                              =
　　2. the sum of x and y; the total of x and y;
　　x added to y; x increased by y;                       x+y
　　x more then y; x greater than y
　　3.  x minus y; x less y;
　　the difference of x and y; x take away y;
　　  from x subtract y' x decreased by y;                      x-y
　　  x diminished by y; y is subtracted from x;
　　  y less than x (note the reversal)
　　4.x multiplied by y;
　　the product of x and y;                                xy
　　5. divided by y;
　　 the quotient of x and y;                          x y,
　　y divided into x (note the reversal)
　　6.A and B are factors of C;
　　A and B are divisors of C;
　　C is divisible by A and by B;                       A B=C
　　C is a multiple of A and of B;
　　A divides C and B divides C;
　　7. the ratio of a to b                                      a:b,
　　8. reciprocal of x                                        1/x
　　9. x times as many z as y;                               z=x y
　　10.a squared;
　　 a to the second power                                  a2
　　11. a cubed;                                            a3
　　a to the third power
　　12. between a and b                                  (a,b)
　　between a and b, inclusive                            [a,b]
　　13. off                                 低于，从……中扣除
　　14. account for                                        占
　　15. one third                                              1/3
　　16. a of x (a fraction of x);                            ax
　　75% of x (a percent of x)                              0.75x