题目

计算：﹣x2•x3=． 答案：﹣x5 ． 【考点】同底数幂的乘法． 【分析】根据同底数幂的乘法的运算法则求解即可． 【解答】解：﹣x2•x3=﹣x2+3 =﹣x5． 故答案为：﹣x5． －Can I help you, dear? －Yeah, I don't know ________ a banana milk shake．Maybe you can teach me． [　　] A．what to do B．who to make C．how to make D．why to do