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= 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. ...