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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 發問中
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 發問中
一則5年級考卷上的未知數問題
Jun 19th 2013, 10:20

這是我們考卷上的問題.老師雖然有講解.但我還是有點不清楚.所以我想問問大家.請求過程.解釋.算式

題目如下:

有一個二位數,個位和十位的數字合起來8,若十位數字是X,則此二位數可用( )
來表示;如果將它的十位數字與個位數字對掉後,所得到的數字可以用( )來表示。(用符號表示數)

我們老師的答案是9X+8和80-9X,但我不了解,我想知道為什麼,不要解釋的太困難ㄛ~

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