Anonymous
Anonymous asked in 科學及數學數學 · 1 decade ago

數學算術題 小六

Mr.Choi有一個蛋糕, 他跟Miss.Tang分享。Mr.Choi取了蛋糕的3份,剩下的給了Miss.Tang。如果Mr.Choi把他的蛋糕的100克給予Miss.Tang , 那麼Mr.Choi所得的份量就是Miss.Tang的兩倍。

請問蛋糕的原重量是多少??

要以方程式回答 ::

Let X be the weight of the cake

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各位回答的朋友只要列第1條式就可以了, 謝謝

5 Answers

Rating
  • j
    Lv 6
    1 decade ago
    Favorite Answer

    Mr.Choi有一個蛋糕, 他跟Miss.Tang分享。Mr.Choi取了蛋糕的3份,剩下的給了Miss.Tang。如果Mr.Choi把他的蛋糕的100克給予Miss.Tang , 那麼Mr.Choi所得的份量就是Miss.Tang的兩倍。

    請問蛋糕的原重量是多少??

    Let y = 一份重量

    3 y = 100 gram

    3y + 2(3y) = x

    所以 :

    x = (100/3)*3 + (100/3) *6

  • 1 decade ago

    x = (100/3)*3 + (100/3) *6

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    Source(s): Myself
  • 1 decade ago

    Mr.Choi本來已蛋糕分了幾份(不知數) , 而他取了其中3份

  • 1 decade ago

    X(總重),Y(全部有幾份)

    X*3/Y-100 = 2( (Y-3)/Y+100)

    if Y is N 1,2,3,....

    X = 300/7, 120,300,1200 (負不合,小於300不合)

    Source(s): 自己
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  • 1 decade ago

    "Mr.Choi取了蛋糕的3份" 是甚麼意思?

    2009-07-15 11:41:26 補充:

    Let x be the weight of the cake

    Let n be the number of pieces

    Weight of each piece = x/n

    Originally Mr Choi has 3(x/n) by weight

    And Miss Tang has (n-3)(x/n) by weight

    After Mr Choi gave 100g to Miss Tang,

    3x/n – 100 = 2[(n – 3)x/n + 100] … (1)

    n > 3 … (2)

    x > 0 … (3)

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