新版小学数学教材线上版：
一年上级册 https://download.pep.com.cn/xsxjc/22xjcsx11x/mobile/index.html
二级年上册 https://download.pep.com.cn/xsxjc/22xjcsx21x/mobile/index.html
三年级上册 https://download.pep.com.cn/xsxjc/22xjcsx31x/mobile/index.html
四年级上册 https://download.pep.com.cn/xsxjc/22xjcsx41x/mobile/index.html
五级年上册 https://download.pep.com.cn/xsxjc/22xjcsx51x/mobile/index.html
年六级上册 https://download.pep.com.cn/xsxjc/22xjcsx61x/mobile/index.html
