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GRE/GMAT数学符号 = 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 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 pi 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 4. x multiplied by y; the product of x and y; xy | 
