问题
解答题
简便方法计算下面各题.
2892+299 327+648+173 6873-451-549 428-98.
答案
(1)2892+299,
=2892+300-1,
=3192-1,
=3191;
(2)327+648+173,
=(327+173)+648,
=500+648,
=1148;
(3)6873-451-549,
=6873-(451+549),
=6873-1000,
=5873;
(4)428-98,
=428-100+2,
=328+2,
=330.