問題詳情
1.若水庫的水位升高7公分用＋7表示，則下降2公分用下列何者來表示？
(A)－2
(B)2
(C)－20
(D)20。
(A)－2
(B)2
(C)－20
(D)20。
參考答案
答案：A
難度：計算中-1
書單：沒有書單，新增
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