47+53=38+56=63－59=4×6 =6×5 =57－18=35－22＝7×3 =7×5 =2×4 =79－75＝55+29=52+39=6×9 =9×7 =54+2...
页数：5页|格式：pptx下载文档
47+53=38+56=63－59=4×6 =6×5 =57－18=35－22＝7×3 =7×5 =2×4 =79－75＝55+29=52+39=6×9 =9×7 =54+2...
页数：5页|格式：pptx下载文档