题目

． 答案：原式=﹣÷[﹣] =﹣÷ =﹣• =﹣ = =． 【点评】本题考查了整式的混合运算和分式的混合运算的应用，能熟记运算法则是解此题的关键，注意运算顺序．23、下面描述的一个故事是一篇记述文的开头，请同学们就此故事展开联想，并另举一个例子说明做好事的重要性。 注意：文中一定要用到 remind … of 这个短语。 A car in front of Mr. Lee had a traffic accident because of traveling too fast. He and a truck driver stopped and helped the injured and they didn’t leave until the police arrived. _____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________