计算:1273-198-98=________ 7999+799+79=________.
977 8877
分析:(1)在计算1273-198-98时,把198看作200-2,98看作100-2原式变为1273-(200-2)-(100-2),再根据减法的性质计算即可,
(2)在计算7999+799+79时,把7999看作8000-1,799看作800-1,78看作80-1,原式变8000-1+800-1+80-1,再根据加法的性质计算即可.
解答:(1)1273-198-98,
=1273-(200-2)-(100-2),
=1273-200+2-100+2,
=973+2+2,
=977;
(2)7999+799+79,
=8000-1+800-1+80-1,
=8000+800+80-1-1-1,
=8880-3,
=8877.
故答案为:977,8877.
点评:此题考查了整数加减法的运算方法.