幫幫手(maths)－udd18ql48m的部落格

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幫幫手(maths)

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有人比左45名員工$200同$300既現金如果這些現金總額係$11800,有多少名員工有$200現金 ? 答案係17 列(識)唔該

最佳解答:

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設有$200現金的人數為x,有$300現金的人數是45-x $200x+(45-x)$300=$11800 $200x+$13500-$300x=$11800 $200x-$300x=$11800-$13500 -$100x=-$1700 x=-$1700/(-$100) x=17

其他解答:

$200x+(45-x)$300=$11800 $200x+$13500-$300x=$11800 $200x-$300x=$11800-$13500 -$100x=-$1700 x=-$1700/(-$100) x=17|||||當有 x 咁多嘅人拎左$200 當有 y 咁多嘅人拎左$300 而總共有 x + y 咁多嘅人係咪!? 先先例兩條式: x + y = 45 , → 總共有45個人啫係 x = 45-y → 方便計... 200x + 300y = 11800 → x 個人有$200, y個人有$300, 總數$11800 將兩條式代入... 200x + 300y = 11800 200(45-y) + 300y = 11800 9000 - 200y + 300y = 11800 100y = 2800 y = 28 → $300現金代埋x, x = 45 - y x = 45 -28 x = 17 → (你個答案) $200現金所以, 共有 17 個人有 $200 現金共有 28 個人有 $300 現金|||||Let x be the no. of 員工有$200現金, y be the no. of 員工有$300現金 x+y=45 x=45-y 200x+300y=11800 x=(11800-300y)/200 so 45-y=(11800-300y)/200 9000-200y=11800-300y y=28 so x+28=45 x=17 有17名員工有$200現金|||||有人比左45名員工$200同$300既現金如果這些現金總額係$11800,有多少名員工有$200現金 ? 答案係17 列(識)唔該 Let x be the number of person receiving $200,y be the number of person receiving $300 x+y=45...(1) 200x+300y=11800..(2) by timing (1) by 300, 300x+300y=13500...(3) By subtracting (3) from (2) 100x=1700 x=17 so the number of person receiving $200 is 17 2006-10-23 00:08:07 補充： the expression should be:By subtracting (2) from (3)