题目内容
用简便方法计算:
(1)576+298
(2)399+626.
(1)576+298
(2)399+626.
(1)576+298
=576+300-2
=876-2
=874;
(2)399+626
=400-1+626
=(400+626)-1
=1026-1
=1025.
=576+300-2
=876-2
=874;
(2)399+626
=400-1+626
=(400+626)-1
=1026-1
=1025.
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