题目

先化简，再求值：，其中x是方程的解。 答案：解：原式                                                 解方程得：                             当时，原式用所给单词的适当形式填空.(共10小题，计10分)【1】He had no idea how to (沟通) with his parents.【2】When the rainstorm came,Jenny (wait), for the bus.【3】The rain began to beat (heavy) against the windows.【4】He often (sweep) the floor himself.【5】Bruce thinks doing housework is a w of time.【6】In summer, people enjoy (swim) in the river.【7】Doing chores helps to develop (child) independence.【8】With the (develop) of Internet, people can chat with each other easily.【9】Students are supposed to use their cell phones at the (恰当的)time.【10】She told him (leave)the children in the forest.