2. 理解并掌握长方体、正方体的表面积的计算方法，能合理、正确解决实际问题。                                                                                                                                                                                                2. 我会用长方体和正方体的表面积公式解决生活中粉刷、包装、切割等问题。                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          

3. 提高归纳整理知识的能力。                                                                                                                                                                                                                       3. 我能采用不同的方法构建知识。