問題詳情
7.若 a＝ 
，b＝
，則 199a－199b 的值為 。
，b＝ ，則 199a－199b 的值為 。
參考答案
答案：B
難度：適中0.431493
統計：A(391),B(844),C(682),D(39),E(0)
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