拆數(shù)補(bǔ)數(shù)
①188+873②548+996③9898+203
答案
①式=(188+12)+(873-12)(熟練之后,此步可略)
=200+861=1061
②式=(548-4)+(996+4)
=544+1000=1544
③式=(9898+102)+(203-102)
=10000+101=10101
①188+873②548+996③9898+203
答案
①式=(188+12)+(873-12)(熟練之后,此步可略)
=200+861=1061
②式=(548-4)+(996+4)
=544+1000=1544
③式=(9898+102)+(203-102)
=10000+101=10101