[喬傑數位]HF-3208 8埠智慧型高速乙太網路交換器 @ 台灣樂天全站4.8折起

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[喬傑數位]HF-3208 8埠智慧型高速乙太網路交換器

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[喬傑數位]HF-3208 8埠智慧型高速乙太網路交換器

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[喬傑數位]HF-3208 8埠智慧型高速乙太網路交換器

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標題:

緊急!!!!!English數學題

發問:

Tom collected baseball cards for a few years before he decided to give them all away and try a new hobby. First he gave half the cards plus one extra card to Leila. Then, he gave half of what was left plus one extra card to Karl. Then, he gave half of what was left plus one extra card to Jarrod. Finally, Tom gave... 顯示更多 Tom collected baseball cards for a few years before he decided to give them all away and try a new hobby. First he gave half the cards plus one extra card to Leila. Then, he gave half of what was left plus one extra card to Karl. Then, he gave half of what was left plus one extra card to Jarrod. Finally, Tom gave the remaining 74 cards to his sister, Charlene. How many baseball cards did Tom have in his collection? 請給我正確的答復.公式

最佳解答:

Tom花了好幾年收集棒球卡，最後決定把它們都送給別人，換個新的嗜好。首先，他把一半加一張的卡片給Lelia。再來，他把剩下的一半加一張的卡片給Karl。接著，他把剩下的一半加一張的卡片給Jarrod。最後，Tom把剩下的74張卡給了他的妹妹，Charlene。 Tom收集了多少棒球卡？設一開始Tom有x張棒球卡 [(x/2 - 1)/2 - 1]/2 - 1 - 74 = 0（這一行也可以省略） [(x/2 - 1)/2 - 1]/2 - 1 = 74 [(x/2 - 1)/2 - 1]/2 =75 (x/2 - 1)/2 - 1 = 150 (x/2 - 1)/2 = 151 x/2 - 1 = 302 x/2 = 303 x = 606 這個題目也可以用倒推的方式來解 (74 + 1)*2 = 150 (150 + 1)*2 = 302 (302 + 1)*2 = 606 但前提是必須知道為什麼要這樣算

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[喬傑數位]HF-3208 8埠智慧型高速乙太網路交換器

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