問題詳情
1.已知x和y是兩組量，若x和y成正比，則下列何者錯誤？
(A) 
成正比
(B) x和 
成反比
(C) 
成反比
(D) (x+y)和(x-y) 成正比。
參考答案
答案：C
難度：計算中-1
書單：沒有書單，新增
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