问题
计算题
用简便方法计算下面各题。
|
答案
(1)原式=732+268+580
=1000+580
=1580
=1200-700
=500
=700+100
=800
(4)原式=657+43-(68+132)
=700-200
=500
= 400-100
=300
=210+638-438
= 410
选择题
用简便方法计算下面各题。
|
(1)原式=732+268+580
=1000+580
=1580
=1200-700
=500
=700+100
=800
(4)原式=657+43-(68+132)
=700-200
=500
= 400-100
=300
=210+638-438
= 410