問題詳情
17. 將分數19/95分子的個位數與分母的十位數相同的數字「9」劃掉,分子留下 1,分母留下 5,形成一個新的分數1/5,然而它與原來的分數等值,即19/95= 1/5。試問在分子與分母都是二位數的真分數中,總共有幾個分數滿足此性質?
(A) 1 個
(B) 2 個
(C) 4 個
(D) 6 個
(A) 1 個
(B) 2 個
(C) 4 個
(D) 6 個
參考答案
答案:C
難度:困難0.294118
統計:A(2),B(4),C(5),D(1),E(0)
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