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中一正負數的應用題!!急!!!!
發問:
1. A point C under water is 23.5 m higher than a point B at the depth of 187.2 m below the water surface. Use a directed number to represent the position of point C if positions below the water surface are taken as negative. 2. One day , the initial temperature of a city in the morning is 23.5 ℃. The the... 顯示更多 1. A point C under water is 23.5 m higher than a point B at the depth of 187.2 m below the water surface. Use a directed number to represent the position of point C if positions below the water surface are taken as negative. 2. One day , the initial temperature of a city in the morning is 23.5 ℃. The the temperature rises 8.49℃ at noon. It then drops 5 .32℃ in the afternoon. iT DROPS A FURTHER 6.86℃ AT NIGHT. a)Use a directed number to represent the total temperature difference of the city between morning and night time on that day. b)Find the temperature of the city at night on that day. ↑ ↑這條數該怎列式??
最佳解答:
正負數的應用題 1. A point C under water is 23.5 m higher than a point B at the depth of 187.2 m below the water surface. Use a directed number to represent the position of point C if positions below the water surface are taken as negative. Since positions below the water surface are taken as negative, C's position is higher than B means that it is less negative than B (by 23.5m) Position of C=Position of B - (-23.5m) =-187.2m-(-23.5m) =-163.7m 2. One day , the initial temperature of a city in the morning is 23.5 ℃. The the temperature rises 8.49℃ at noon. It then drops 5 .32℃ in the afternoon. It drops a further 6.86℃at night. a)Use a directed number to represent the total temperature difference of the city between morning and night time on that day. Denote rise in temperature by +, and drop by -. Morning/noon temperature difference:+8.49℃ Noon/afternoon temperature difference:- 5 .32℃ Afternoon/night temperature difference: -6.86℃ Therefore total temperature difference between morning and night =+8.49℃+(- 5 .32℃)+( -6.86℃) =-3.69℃ b)Find the temperature of the city at night on that day. 列式 Temperature at night = Temperature in morning + total temperature difference between morning and night 2011-09-17 13:53:48 補充： b)Find the temperature of the city at night on that day. 列式 Temperature at night = Temperature in morning + total temperature difference between morning and night =23.5 ℃+(-3.69℃) =23.5 ℃-3.69℃ =19.81℃
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