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  • log problem solving

    log(1/3)(log3(x))=1

    Solve x

    ___________________________

    1/3同3都係log下面

    4 個解答數學8 年前
  • Chemistry Homologous series

    我想問:

    Why does the solubility in water of carbon molecules(in all homologous series )decrease with increasing carbon atoms ?

    1 個解答化學8 年前
  • Microscopic world ii

    我見過一條A-LEVEL QUESTION,as follow

    Explain HI has higher boiling point than HBr

    答案話:HI has greater number of eletrons,so the boiling point of HI is higher.

    不過我本書冇講過,所以我用molecular size 解釋,is it ok?

    2 個解答化學8 年前
  • Maths question!

    A teacher wants to divide a class of 18 students into 3 groups, each of 6 students, to do 3 different statistical projects.In how many ways can the students be grouped?

    _________________________________________

    Answer:18C6*12C6*6C6=17153136

    點解唔使除3!?

    3 個解答數學8 年前
  • Maths question!

    y is inversely proportional to x

    __________________________

    如果我地DRAW一幅y against(1/x)的graph,是會穿過(0,0)的.

    但係如果substitute(0,0) into y=k/x 的時侯,就會變左0=1/0

    ______________

    問題:

    其實它是否穿過(0,0)?

    1 個解答數學8 年前
  • PHYSIC Questions!

    圖片參考:http://imgcld.yimg.com/8/n/HA05329604/o/2013021016...

    Q1:

    我想問呢幅FREE-BODY DIAGRAM(no friction)岩唔岩?

    如果岩,它唔係應該掉下去?點解可以仲做CIRCULAR MOTION?

    PS:當R指向圓心

    _________________________

    Q2:

    以上2個BALL都係IDENTICAL,我想問邊條STRING 的TENSION大D?

    1 個解答其他 - 科學8 年前
  • Inter-Conversion of carbon!

    CH3CH2(CHCl)CH3----------->CH3-(C=O)-(C=O)-CH3

    How can it convert?

    ______________________________

    CH3CH2CH2OH------->CH3-(C=O)-CH3

    CH3CH2CH2OH唔係primary alcohols?唔係應該做aldehyde?

    1 個解答化學8 年前
  • Combination problems X2!

    In a parent-teacher association,there are 5 couples.A project team of 4 people is going to selected from the 5 couples.Find the numbers of way to form the team if:

    a:the team consists of no couples

    b:the team consists of exactly 1 couple

    ____________________________________________

    有30個人,大家要互相握手.有幾多方法?

    ________________________________________________________

    Please explain clear in details in Chinese!

    2 個解答數學8 年前
  • Combination Problem!

    Nancy has bought 10 different present.In how many way can she divide the presents into 5 groups of 2?

    _____________

    A 5-card poker hand is selceted from a deck of 52 playing cards.How many different poker hands contain exactly one pair?

    1 個解答數學8 年前
  • F4 physic!(lens and force)

    What is sharp image?

    What is resultant force?

    Explain them in Chinese or English.

    Not Homework!

    1 個解答其他 - 科學8 年前
  • F4 Chem questioin

    Which of the following methoods suitable for preparing a sample of lead sulphate?

    add lead to dilute sulphuric acid

    add lead to CuSO4 solution

    add lead(II) oxide to dilute sulpuric acid

    add lead(II) nitrate solution to dilute sulphur acid

    呢D題目應該點做?

    ____________________________________

    Which of the following combination(s) would show a rise in temperature and give a clear solution?

    A:Concentrated sulphuric acid + water

    B:Dilute sulphuric acid +limewater

    C:dilute NaOH + dilute sulphuric acid

    唔係個個都會溫度上升?什麼是CLEAR SOLUTION?

    1 個解答化學9 年前
  • F4 Maths question!

    When a polynomial f(x) is divided by x-5,the remaider is 9.When it is divided by x+2,the remainder is -5.Find the remainder when f(x) divided by (x+2)(x-5)

    1 個解答數學9 年前
  • F4 PHY.!

    Please solve the following questions!

    _______________

    圖片參考:http://imgcld.yimg.com/8/n/HA05329604/o/7011101000...

    2 個解答其他 - 科學9 年前
  • F3 maths question!

    求AB的slope,我唔知係2/50定係50/2..

    圖片參考:http://imgcld.yimg.com/8/n/HA05329604/o/7011050301...

    4 個解答數學10 年前
  • F3 Maths question!

    左三角形ABC中,已知sin(A/2)=(sqrt5)/3

    求sin((B+C)/2)的值

    ___________________________________

    Please construct a triangle if it is possible!

    3 個解答數學10 年前
  • F3 chem.!(Not homework)

    How to draw the ionic bond formed by Calcium(2,8,8,2) and Chlorine(2,8,7)?

    What is the chemical formula?

    __________

    How to draw the ionic bond formed by Lithium (2,1)and sulphur(2,8,5)?

    What is the chemical formula?

    ________________

    4 個解答化學10 年前
  • 文言文句式判斷

    判斷以下句子是否判斷句.

    燕雀安知鴻之志哉?

    夫戰,勇氣也。

    予謂花,花之隱逸者

    1 個解答語言10 年前
  • 文言文translation!!!!!(6)

    子路問:「聞斯行諸?」子曰:「有父兄在,如之何其聞斯行之!」冉有問:「聞斯行諸?」子曰:「聞斯行之。」公西華曰:「由也問:『聞斯行諸?』子曰:『有父兄在。』求也問:『聞斯行諸?』子曰:『聞斯行之。』赤也惑,敢問。子曰:「求也退,故進之;由也兼人,故退之。」

    What is 聞斯?

    最好有全段翻譯!

    1 個解答語言10 年前