送分的maths題

2007-09-23 7:51 pm

小明現在m yrs old
2年前佢老豆既帥數係佢既5倍
咁佢老豆now幾帥?

更新1:

book既ans係話5m-8

回答 (7)

2007-09-23 8:40 pm

✔ 最佳答案

His father's age 2 years ago = (m - 2)* 5 = 5m - 10

Now, after 2 years,

his father's age = 5m - 10 + 2 = 5m - 8

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2007-09-24 7:47 pm

小明2年前歲數 = m - 2
佢老豆2年前歲數 = 5 x (m - 2)
佢老豆宜家歲數 = 5 x (m - 2) + 2
= 5m - 10 + 2
= 5m - 8

參考: me

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2007-09-23 8:41 pm

佢老豆now好帥........

( m - 2 ) X 5 + 2

m是任何一個6-14的自然數(佢老豆2年前是20-60歲)

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2007-09-23 8:11 pm

就係5m+2咩....果然簡單啊....hoho

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2007-09-23 7:58 pm

小明現在係5m+2咁多歲

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2007-09-23 7:58 pm

佢老豆now [5(m-2)+2] yrs old

2007-09-24 23:05:49 補充：
[5(m-2)+2] =5m-10+2=5m-8(yrs old)

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2007-09-23 7:55 pm

老豆now歲數=5m+2
我系米好醒呢~~~

參考: my self

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