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標題:
1981CEMCQ
發問:
I dunno how to do the following questions: http://www.mediafire.com/view/ig82wu8ne5lecci/CE_Math_81_P2.pdf 13.(C) 15.(E) 17.(D) 23.(D) 29.(C) 38.(D) 43.(C) 44.(B) 45.(A) 49.(E) 53.(C)
最佳解答:
13. Cost = Marked price - Profit = x - 0.3x =0.7x Selling price = 0.8x Profit = Selling price - Cost = 0.8x-0.7x = 0.1x 15 Volume increase ={ [ sq rt(1.44) ]^3 -1 } x 100% = 72.8% 17.Let the cost of each chair be $C. Total cost =100C Money acquired = 80 x 1.3 C + 20 x 0.6 C = 116C Profit = 116C - 100C = 16C % profit = 16c/100c x 100% = 16% 23.A line drawn in the figure // and equals to AB. http://postimg.org/image/edykyaznd/ ED = p cosθ DF = q sin? AB = ED + DF = p cosθ + q sin? 29. 2x^2-2<=0 x^2-1<=0 (x+1)(x-1)<=0 The solution is -1
第49題應該係 let AB=h
1981CEMCQ
發問:
I dunno how to do the following questions: http://www.mediafire.com/view/ig82wu8ne5lecci/CE_Math_81_P2.pdf 13.(C) 15.(E) 17.(D) 23.(D) 29.(C) 38.(D) 43.(C) 44.(B) 45.(A) 49.(E) 53.(C)
最佳解答:
13. Cost = Marked price - Profit = x - 0.3x =0.7x Selling price = 0.8x Profit = Selling price - Cost = 0.8x-0.7x = 0.1x 15 Volume increase ={ [ sq rt(1.44) ]^3 -1 } x 100% = 72.8% 17.Let the cost of each chair be $C. Total cost =100C Money acquired = 80 x 1.3 C + 20 x 0.6 C = 116C Profit = 116C - 100C = 16C % profit = 16c/100c x 100% = 16% 23.A line drawn in the figure // and equals to AB. http://postimg.org/image/edykyaznd/ ED = p cosθ DF = q sin? AB = ED + DF = p cosθ + q sin? 29. 2x^2-2<=0 x^2-1<=0 (x+1)(x-1)<=0 The solution is -1
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其他解答:第49題應該係 let AB=h
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