用简便方法计算 1,999×778+333×666 2,198×197-197×196-19用简便方法计算1,999×778+333×6662,198×197-197×196-196×195+195×194
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![用简便方法计算 1,999×778+333×666 2,198×197-197×196-19用简便方法计算1,999×778+333×6662,198×197-197×196-196×195+195×194](/uploads/image/z/1239220-28-0.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97+1%2C999%C3%97778%2B333%C3%97666+2%2C198%C3%97197-197%C3%97196-19%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%971%2C999%C3%97778%2B333%C3%976662%2C198%C3%97197-197%C3%97196-196%C3%97195%2B195%C3%97194)
用简便方法计算 1,999×778+333×666 2,198×197-197×196-19用简便方法计算1,999×778+333×6662,198×197-197×196-196×195+195×194
用简便方法计算 1,999×778+333×666 2,198×197-197×196-19
用简便方法计算
1,999×778+333×666
2,198×197-197×196-196×195+195×194
用简便方法计算 1,999×778+333×666 2,198×197-197×196-19用简便方法计算1,999×778+333×6662,198×197-197×196-196×195+195×194