Re: [計量] 問一題考古題
※ 引述《BJ911 (瑋仔)》之銘言:
: 比大小題型
: N R S T
: ___ + ___ = ___ + ___
: 4 8 8 6
: N,R,S,T are positive integers
: A: 2N+R B: 2S+T
: 答案是A
: 可是我覺得是B ???
: 這種題型要怎麼解呀 >o<
: 謝謝解答囉~~
6N+3R=3S+4T
2N+R=S+4/3T
因為N,R,S為正整數,T必為3之倍數
令T=3T' T' is also a positive integer
2N+R-2S-T
=(S+4/3T)-2S-T=1/3*T-S=T'-S
T'-S要多大多小,自己看著辦摟
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