牛刀小試五問 09 - 拼圖
By Valerie
at 2013-01-29T21:31
at 2013-01-29T21:31
Table of Contents
══════════════ 牛刀小試五問 09 ═══════════════
第一問
伊凡擁有一塊巨大的正三角形土地,他想在上頭築一幢別墅,再從房子向三個邊
建造三條道路,道路與邊界垂直。為了讓三條路的總長度縮到最短,伊凡應該將別墅
蓋在土地上的哪個位置?
第二問
將正整數1~7隨意排列成一個七位數,則此數可被11整除的機率為何?
第三問 EEO
籃子內有一打以上的雞蛋,包含兩種顏色。設白蛋有a個,棕蛋有 × OO
b個,則a與b的和倒過來便是a與b的乘積。請問籃子內有幾顆蛋? ───────
EOEO
第四問 EOO
右列乘式中,每個E都代表偶數(包含0)、每個O都代表奇數, ───────
但不是所有的E都表示相同的數字,O亦然。你能找出答案嗎? OOOOO
第五問
小查與寇弟正在進行一個數字遊戲:兩人輪流在紙上寫一個小於100的數字,當
一方能將記錄下來的數字分成兩組使其總和相同時便獲勝,例如19+27=2+39+5。
每次遊戲結束的快慢或許不同,但最遲在寫出幾個數字之後,必定可以結束?
───────────────────────────────────────
解答區
已解決 一、蓋在哪裡都一樣
已解決 二、4/35
已解決 三、18顆,兩種顏色各九顆
已解決 四、285×39=11115
已解決 五、10
═══════════════════════════════════════
注意!推文可能有答案!思考之後再往下看!
--
第一問
伊凡擁有一塊巨大的正三角形土地,他想在上頭築一幢別墅,再從房子向三個邊
建造三條道路,道路與邊界垂直。為了讓三條路的總長度縮到最短,伊凡應該將別墅
蓋在土地上的哪個位置?
第二問
將正整數1~7隨意排列成一個七位數,則此數可被11整除的機率為何?
第三問 EEO
籃子內有一打以上的雞蛋,包含兩種顏色。設白蛋有a個,棕蛋有 × OO
b個,則a與b的和倒過來便是a與b的乘積。請問籃子內有幾顆蛋? ───────
EOEO
第四問 EOO
右列乘式中,每個E都代表偶數(包含0)、每個O都代表奇數, ───────
但不是所有的E都表示相同的數字,O亦然。你能找出答案嗎? OOOOO
第五問
小查與寇弟正在進行一個數字遊戲:兩人輪流在紙上寫一個小於100的數字,當
一方能將記錄下來的數字分成兩組使其總和相同時便獲勝,例如19+27=2+39+5。
每次遊戲結束的快慢或許不同,但最遲在寫出幾個數字之後,必定可以結束?
───────────────────────────────────────
解答區
已解決 一、蓋在哪裡都一樣
已解決 二、4/35
已解決 三、18顆,兩種顏色各九顆
已解決 四、285×39=11115
已解決 五、10
═══════════════════════════════════════
注意!推文可能有答案!思考之後再往下看!
--
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