多米诺学校· 关注成长、提升成绩计算突破三：分数巧算之变形约分（教师版课后练习）小升初教研中心· 数学组1 课后练习三：分数巧算之变形约分姓名评分一、巧算下面各题1. 202012020202020212022 2. 11200201199200解：原式2020202120201202020212022解：原式20012002001992002021120202020(20211)2022200199200120019920020211202220221991200200(1991)2001199120020013. 201320152014201420151 4. 1.28.51.71.38.40.98解：原式201320152014(20131)20151解：原式1.2(8.40.1)1.7(1.20.1)8.40.98201320152014201320151201511.28.41.20.11.71.28.40.1 8.40.982013201520142013201520141.28.41.821.28.41.82115. 2222011201020112011 20102010 6. 2707171717303030323232323232323232323解：原式222201120102011(201120102010 )解：原式2710117 101013 10101012323 10123 1010123 101010122201120102011(20112010)201027173232323232220112010201120102323117. 2255(97)()7979多米诺学校· 关注成长、提升成绩计算突破三：分数巧算之变形约分（教师版课后练习）小升初教研中心· 数学组2 解：原式229779557955() 13795579138. 0.10.20.30.20.40.60.30.60.90.40.8 1.20.20.30.50.40.6 1.00.60.9 1.50.81.22.0解：原式3333330.1 0.20.3(1234 )0.20.30.5(1234 )2323 5159. 123109110109321222555解：原式21112 1115 11111010. 111111(1)(1)(1)(1)(1)(1)2410359解：原式351124102410359325491011()()()2345109101110
