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假設這兩個數分別為x,y 則:(7.2x)/0.8*y=9 解這個方程,得:xy=1 所以只要這兩個數互為倒數,這個式子就成立,比如2,2分之一;3,三分之一等等,只要護衛倒數就成立. 當然,0沒有倒數,不要考慮0.
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