三位数连加连减
数的运算应当细心地观察,为的是理解;应当努力地理解,为的是行动。罗曼·罗兰第三单元第三单元加与减加与减专项练习专项练习列竖式计算:列竖式计算:(红色字体要验算)844+932-226=844+932-226= 199+398+456=199+398+456= 801+160-278=801+160-278= 814+551-450=814+551-450= 175+505-320=175+505-320= 481+21-420=481+21-420= 665+1000-133=665+1000-133= 729+180-233=729+180-233= 306+812-562=306+812-562= 128+611-578=128+611-578= 263+206+352=263+206+352= 644+104+323=644+104+323= 脱式计算:脱式计算: 750-253+368750-253+368 659-567-274659-567-274 577-545+368577-545+368 599-481+368599-481+368= = = = = = = = = = = = = = =641-353+123641-353+123 940-456+368940-456+368 979-488+143979-488+143 680-502+368680-502+368 = = = = = = = = = = = = = = =637-631+143637-631+143 911-75-274911-75-274 975-883+143975-883+143 894-162+368894-162+368= = = = = = = = = = = = = = = =