國一數學問題~2題(數線及絕對值):－線上遊戲排行榜2013/2014,進擊的巨人線上看,candy crush saga外掛,正妹寫真三圍

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Aug 19th 2013, 14:04

1.和傑、小茜兩人分別在數線上表示-12與33的位置上，同時相向而行，若和傑的速率是小茜的2倍，試回答下列問題：
(1)兩人相遇時，小茜走了多少個單位長?
解析是這樣寫的：
和傑的速率是小茜速率的2倍，2人相遇時，小茜走了45/(2+1)=15個單位長
(45/(2+1)的那段看不懂，尤其是(2+1).....看不懂!!)

(2)若兩人在P點相遇，則P點的座標為何?
解析是這樣寫的：
兩人相遇時,小茜走了15個單位長，所以P點座標為33-15=18
(有點看不懂為什麼是33-15那段!!)

2.設a、b、c三數均為整數，且│a│+3x│b+8│+8x│c-5│=2，試求a、b、c之值。
解析是這樣寫的：
a.b.c均為整數，所以│a│、│b+8│、│c-5│必為整數或0
又因為│a│+3x│b+8│+8x│c-5│=2
所以│a│=2，│b+8│=0，│c-5│=0
故a=2或-2，b=-8，c=5
(這個...完全看沒有..= =)

求講解~~~謝謝,解出來的是高手ㄚ~~~

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