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數學題目一問(20點!!!)
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請回答下列的數學題1.The boiling point and melting point of mercury are about 357℃ and -39℃.Find the difference in temperature between its boiling point and melting point.2.David bought x apples.He ate 2 of them and 8 apples were left.Find x.3.Mrs Lee bought 3 kg of pork.She paid $50 and got back $8 change.How... 顯示更多 請回答下列的數學題 1.The boiling point and melting point of mercury are about 357℃ and -39℃.Find the difference in temperature between its boiling point and melting point. 2.David bought x apples.He ate 2 of them and 8 apples were left.Find x. 3.Mrs Lee bought 3 kg of pork.She paid $50 and got back $8 change.How much did 4 kg of pork cost? 4.Danny has 14 model cars. a)As his mother is worried that he will spend too much money on model cars, she proposes the following to Danny: ''The maximum number of model cars that Danny can have is 20.'' Let the total number of model cars that Danny can have be x. i)Write an inequality to represent this situation. ii)Hence find at most how many more model cars he can have. b)However, he makes the following counter-proposal: ''Apart from the condition stated above, I would like the total number of model cars to be greater than 17.'' i)How many model cars can he have under this situation? ii)Hence find at least how many more model cars he can have. thx;D
最佳解答:
New Syllabus MATHS Summer Vacation Exs F.1~F.2 P.3 Q.5 P.11 Q.14 P.12 Q.17 P.14 Q.22 2010-07-17 17:18:18 補充： 請回答下列的數學題1.The boiling point and melting point of mercury are about 357℃ and -39℃.Find the difference in temperature between its boiling point and melting point.A. the difference= 357-(-39)= 396℃2. David bought x apples. He ate 2 of them and 8 apples were left. Find x.A. x-2 = 8x = 10So, x = 103. Mrs Lee bought 3 kg of pork. She paid $50 and got back $8 change. How much did 4 kg of pork cost?A. the cost of 4 kg of pork= (50-8)/3 * 4= 168/3= $564. Danny has 14 model cars.a) As his mother is worried that he will spend too much money on model cars, she proposes the following to Danny:''The maximum number of model cars that Danny can have is 20.''Let the total number of model cars that Danny can have be x.i) Write an inequality to represent this situation.A. x x= means greater than or equal to.) 2010-07-17 17:19:19 補充： 1.The boiling point and melting point of mercury are about 357℃ and -39℃.Find the difference in temperature between its boiling point and melting point. A. the difference = 357-(-39) = 396℃ 2. David bought x apples. He ate 2 of them and 8 apples were left. Find x. A. x-2 = 8 x = 10 So, x = 10 2010-07-17 17:19:48 補充： 3. Mrs Lee bought 3 kg of pork. She paid $50 and got back $8 change. How much did 4 kg of pork cost? A. the cost of 4 kg of pork = (50-8)/3 * 4 = 168/3 = $56 2010-07-17 17:21:04 補充： 4. i) Write an inequality to represent this situation. A. x x= means greater than or equal to.)
其他解答:
1.The boiling point and melting point of mercury are about 357℃ and -39℃.Find the difference in temperature between its boiling point and melting point. Ans: Difference = 357℃ – (-39℃) = 396℃ 2.David bought x apples. He ate 2 of them and 8 apples were left. Find x. Ans: x – 2 = 8 x = 8 + 2 x = 10 3.Mrs Lee bought 3 kg of pork. She paid $50 and got back $8 change. How much did 4 kg of pork cost? Ans: Cost of 3 kg pork = $50 – 8 = $42 Cost of 1 kg pork = $42 / 3 = $14 Cost of 4 kg pork = $14 x 4 = $56 4.Danny has 14 model cars. a)As his mother is worried that he will spend too much money on model cars, she proposes the following to Danny: ''The maximum number of model cars that Danny can have is 20.'' Let the total number of model cars that Danny can have be x. i)Write an inequality to represent this situation. ii)Hence find at most how many more model cars he can have. Ans: (i)x
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