標題:
2 questions of F.1 maths (10x2 marks)
發問:
1. If the product of -8 and -2 is subtracted from the sum of -4 and 3, what is the result obtained?2. A V-shaped pen-holder holds one layer of red pens then one layer of blue pens. The bottom layer has one red pen, and each layer has one more pen than the layer below it. If there are 35 layers, how many red and... 顯示更多 1. If the product of -8 and -2 is subtracted from the sum of -4 and 3, what is the result obtained? 2. A V-shaped pen-holder holds one layer of red pens then one layer of blue pens. The bottom layer has one red pen, and each layer has one more pen than the layer below it. If there are 35 layers, how many red and blue pens are there? * Please show all the steps in each queations.
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最佳解答:
1. If the product of -8 and -2 is subtracted from the sum of -4 and 3, what is the result obtained? The result: (-8) x (-2) - [ -4 + 3 ] =16 - ( - 1) =16+1 =17 the required answer is 17. 2. A V-shaped pen-holder holds one layer of red pens then one layer of blue pens. The bottom layer has one red pen, and each layer has one more pen than the layer below it. If there are 35 layers, how many red and blue pens are there? there are pens: 1+2+3+4+.....+33+34+35 there are 35 terms (35/2) x [ 2(1)+ ( 35-1)(1)] =(35/2) x (36) =630 hence,there are 630 pens.
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