义务教育课程标准实验教科书人教版数学五年级上册“平行四边形的面积”一课,教材是以一幅主题图为背景展开的,主题图上画的是一所学校的大门口,有马路、房子、斑马线等教学素材,其中比较有价值的是学校门口还画了两个大花坛,一个是长 Compulsory education curriculum standard experimental textbook PEP fifth grade on the volume “area of ​​parallelogram ” class, textbook is a theme map as the background, the theme of the picture is the entrance of a school, there are Roads, houses, zebra crossing and other teaching material, of which more valuable is the school gate also painted two large flower beds, one is long