right angle, obtuse angle, acute angle, perpendicular line, parallel line, 9.27, 1h 30 min - 90 min, 4h 13 min - 253 min, 100 min - 1h 40 min, 263 min - 4h 23 min, 1/2+ 1/2= - 1 whole, The numerator is 7,the denominator is 10 - 7/10, 1/4 - 2/8=3/12=4/16, 5/8 is greater than - 4/9, 3/8 is smaller than - 1/2,

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