問題詳情
7.21×(－22 )×23×(－24 )×25×(－26 )×…×29×(－30 )×31的結果為______數。( 填正或負 )
參考答案
答案：B
難度：適中0.461538
統計：A(118),B(102),C(1),D(0),E(0)
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