还是陈向东里面的: If C is the tmeperature in degrees Celsins and F is the temperature in degrees Fahrenheit, then the relationship between tmeperatures on the two scales is expressed by the equation 9C=5(F-32). On a day when the temperature exptremes recorded at a certain weather station differed by 45 degrees on the Fahrenheit scale, by how many degrees did the temperature extremes differ on the Celsius scale? A 65/9 B. 13 C. 25 D. 45 E. 81 CXD 的解释是:根据C=5/9(F-32), 可得#C=5/9#F, 所以#C=5/9*45=25 (注:原书中#应为“三角or delta",我因打不出delta符号,用#代替。) highlight部分怎么出来的?32不要减掉了? 多谢! |