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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 投票中 
等差級數題目 急需答案!! +20點
Jul 28th 2013, 10:47

第一包貨物扳回車上所走的是(90-1)X3 第90包和第一包的距離
第二包貨物扳回車上所走的是(90-2)X3X2 因為是從車子走道貨物處在走回車子所以X2
第三包(90-3)X3X2
.
.
.
第89包(90-89)X3X2
第90包 零

全部
(90-1)X3+(90-2)X3X2+(90-3)X3X2+....+(90-89)X3X2
第一個先分開算
(90-1)X3=267

後面
(90-2)X3X2+(90-3)X3X2+....+(90-89)X3X2 = 88X3X2+87X3X2+....+1X3X2
把X2X2提出來
(88+87+...+1)X3X2 = (88+1)X(88-1)/2 X3X2
梯形公式 (上底加下底)X高除以2
等於23229
在加回第一包267

等於 23496

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