第三单元《加与减》专项练****br/>列竖式计算:(红色字体要验算)
844+932-226= 199+398+456= 801+160-278= 814+551-450=
175+505-320= 481+21-420= 665+1000-133= 729+180-233=
306+812-562= 128+611-578= 263+206+352= 644+104+323=
脱式计算:
750-253+368 659-567-274 577-545+368 599-481+368
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641-353+123 940-456+368 979-488+143 680-502+368
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637-631+143 911-75-274 975-883+143 894-162+368
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