作者tatuwrc (c8 8c )
看板GRE_Verbal
标题[计量] 一题数学
时间Tue Jun 3 00:42:24 2008
那呈我刚刚问的观念~
If Sam were twice as old as he is, he would be
40 years older than Jim. If Jim is 10 years younger
than Sam, how old is Sam?
我的算法是
2sam = he
he = J +40
J = S-10
解联立~
可是这跟之前版友的回答就抵触了
依版友的回答应该是sam = 2he 吧
我时在不知道我的盲点在哪= =
麻烦各位板友了~谢谢~
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 122.120.112.208
1F：→ tatuwrc:答案是30忘了说~122.120.112.208 06/03 00:46
2F：推 reznor:Sam x 2 = Jim + 40; Sam = Jim + 10; 171.69.45.134 06/03 01:03
3F：→ reznor:二元一次联立方程式 171.69.45.134 06/03 01:03
4F：→ liuwanju:2Sam - 40 = Sam -10 式子两边皆为Jim 61.227.60.29 06/03 01:14
5F：→ liuwanju:twice as old as he is：他实际年龄的2倍 61.227.60.29 06/03 01:32
6F：→ tatuwrc:感谢楼上的版友~我知道我错在哪了~122.120.112.208 06/03 01:39