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9的999次方 數學高手入

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你好, 中學有一些問題,還請解答. 1.9的999次方中個位數字是甚麼數(1,2,3,4,5,6,7,8,9,0) 2.小明在圖書館借了六本書,但用3張圖書證借了它的3倍書數量. 4星期假期完結後,小明遲還書. 如果一天罰0.5元,問要罰多少? 3.大文在2400米世界盃中跑得第22名,用了時間13分鐘,如果第10名選手以40km/h(最後400米的速度)是在他164人位後衝過終點,而大文此時正以時速35km/h加速最後400米,如果路程延長多500米,大家速度不變,大文有否機會追到第10位衝線? 4.0+5-4+0.618÷3(0.618)(3)(3)=? 5.3(3-3+4)/2=? 更新: 第2題有錯,不好意思,圖書館遲還是計一星期(7天) 第3題都有錯,各人速度是相反的,是場2400米長跑比賽. 更新 2: 第4題無錯,但便是有一些混淆 更新 3: 根據意見3的問題,第2本書是計書不是計卡. 更新 4: 第2題的計法:6本書乘3張卡所借的18本書,再乘0.5元.

最佳解答:

1.Let me tell you one method.While you are doing this type of question. You can use it. x^(y)=x^(the remainder after y/4) Only when you are finding the 個位數 For example. 9^(999) =9^(the remainder after 999/4) =9^(3) =729 so the 個位數 is 9. 2.The total amount that he borrow =3x6 =18 As the public library usually ask you return the books after 2weeks (you can also let y be the time he late) =4weeks-2weeks or = 4weeks-y weeks =2weeks So the total money he need to pay =18x2weeks x$(0.5x7)/weeks or=18x(4-y)weeks x $(0.5x7)/weeks =$(36x3.5) =$(72x3.5-y x 3.5) =$126 =$(252-3.5y) 3. I will draw it. 1- - - - - - - - - - - - -1---------------------1 500m 第10位 400m 大文 大文 need to run (500+400)m So the time he need to finish the competition =900m / (40km/h) =(900m/40km)h =(900m/40000m)h =0.0225 第10位 need to run 500m So the time he need to finish the competition =500m/(35km/h) =(500m/35km)h =(500m/35000m)h =(1/70)h =0.0142857142857.......... As 0.0142857......h is smaller than 0.0225h so 大文 need more time than第10位 to finish the competition. Therefore 大文沒有機會追到第10位衝線. 4. 0+5-4+0.618÷3(0.618)(3)(3) =(0+5-4)+0.618(0.618)(3)(3)÷3 =1+0.618(0.618)(3) =1+1.145772 =2.145772 5. 3(3-3+4)/2 =3x4/2 =6 2012-03-02 20:01:46 補充: sorry that I don't know how to type Chinese words.I'm very sorry for that. 2012-03-02 20:03:50 補充: sorry that in question 3 ,(0.025)should be 0.025h.

其他解答:

第二條唔理幾多張卡……都係借咗6本,理得佢用6張卡6本書同5張卡借6本書。 問題係按卡收錢定按書收錢?|||||我見到"9的999次方=999的9次方" =.= 我直接拜服=.=|||||1. 9^999 = 9 x 9^998 = 9 x (9^2)^499 9^2 = 81 個位數是 1 所以 2^999 的個位數 = 9 x 1^499 = 9 x 1 = 9 第 2 題看不明題目,不再做下去。|||||樓上的,9既999次方同999既9次方係唔同架= ="(999既9次方都唔係999X9X9X9X9X9X9X9X9X9啦= =") 講番D題目先 1.做呢d題睇下d規律先 9^1=9(個位9) 9^2=9x9=81(個位1) 9^3=81x9=729(個位9) 2次一個循環,個位數字就9,1,9,1,9咁去 所以9^999個位數字係9~ 2.小明在圖書館借了六本書,但用3張圖書證借了它的3倍書數量. 4星期假期完結後,小明遲還書. 如果一天罰0.5元,問要罰多少? 題目好唔清楚= =希望我睇岩啦 借左6本書既3倍書數量=18本? 4星期假期完左 =遲左2星期還(通常圖書館都係2星期內要你還書) =0.5*18*7*2 =$126 (咩人會kai到同一本書用3張圖書證借3次?題目又唔講點先算過期? 4星期假期完結後,小明遲還書姐係小明幾時還書?) 3.上網搵2400米世界盃都係有關跑馬既= ="大明係馬? 無可能,大明係22名,speed又慢過第10名,點追得上? 4. 0+5-4+0618/3(0.618)(3)(3)=? 條式本身就錯 無0.618/3(0.618)(3)(3)呢種數 一係乘一係除,咁樣寫好誤導 5.同上5AEEC82B53E1B405

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