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各位知識朋友 , 入黎幫我手 ar !!! ( 數學F.1 ) (61)
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各位知識朋友 , 入黎幫我手 ar !!!我有幾條數學問題唔識 , 幫手解答 ar( 數學F.1 )!!!!!!!!!!!!!!! (要步驟)1.A shopowner sells three items A,B and C with the following results:Item A: a loss of $540Item B: a gain of 720Item C: a loss of $310(a) Does he gain or lose as a whole(b) Find the gain or loss2.In the multiple-choice... 顯示更多 各位知識朋友 , 入黎幫我手 ar !!! 我有幾條數學問題唔識 , 幫手解答 ar( 數學F.1 )!!!!!!!!!!!!!!! (要步驟) 1.A shopowner sells three items A,B and C with the following results: Item A: a loss of $540 Item B: a gain of 720 Item C: a loss of $310 (a) Does he gain or lose as a whole (b) Find the gain or loss 2.In the multiple-choice test,there are 24 questions.For each question, 4 marks are given for a correct answer,3 marks are deducted for an incorrect answer and 2 marks are deducted for no answer.John attempts 18 questions, and only answers 9 questions correctly.Find his final score. 3.Subtract the sum of -6.5 and -2.4 from the sum of 3 and -4
最佳解答:
1, reslut = -540+720-310 = -130 therefore, (a) he lose as a whole (b) the loss is $130 2, total questions = 24 no. of questions that John did not answer = 24 - 18 = 6 no. of questions that John attempts = 18 no. of questions that is correct = 9 no. of question that is incorrect = 18 - 9 = 9 total score = ( no. of questions that is correct )*4 -( no. of question that is incorrect )*3 -( no. of questions that John did not answer )*2 = 9 * 4 - 9 * 3 - 6 * 2 = -3 therefore, his final score is -3 3, the sum of -6.5 and -2.4 = -6.5 +(-2.4) = -6.5 - 2.4 = -8.9 the sum of 3 and -4 = 3 + (-4) = 3 - 4 = -1 Subtract the sum of -6.5 and -2.4 from the sum of 3 and -4 = (the sum of 3 and -4 ) - ( the sum of -6.5 and -2.4 ) = -1 - (-8.9) = -1 + 8.9 = 7.9
其他解答:
1. lose 130 2. 5 3. -1 2008-07-18 19:30:12 補充： the answer of 3. is 7.9
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