a平方的2倍与3的差,用代数式表示为( );当a=﹣1时,此代数式的值为( ). 发布时间:2017-05-18 21:38 │ 来源:www.tikuol.com 题型:填空题 问题: a平方的2倍与3的差,用代数式表示为( );当a=﹣1时,此代数式的值为( ).
题型:填空题 The UN has already____the use of chemical weapons during warfare, since they are too destructive. [ ]A. approved B. allowed C. banned D. protected 查看答案