题目

多项式a3﹣3ab2+3a2b﹣b3按字母b降幂排序得    ． 答案：﹣b3﹣3ab2+3a2b+a3 ． 【分析】先分清多项式的各项，然后按多项式降幂排列的定义排列． 【解答】解：多项式a3﹣3ab2+3a2b﹣b3的各项分别是：a3、﹣3ab2、3a2b、﹣b3．He has little acquaintance _______ music , while he has a wide knowledge ____ painting．A．with ; ofB．of ; aboutC．with ; about D．of ; of