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新GRE数学常见符号英文表达： = 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 st 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 | 
