(1)原式=732+268+580
=1000+580
=1580 (2)原式=1200-(627+73)
=1200-700
=500 (3)原式=625+75+(49+51)
=700+100
=800
(4)原式=657+43-(68+132)
=700-200
=500 (5)原式= 468-68-(62+38)
= 400-100
=300 (6)原式=210+(115+523)-438
=210+638-438
= 410
(1)原式=732+268+580
=1000+580
=1580 (2)原式=1200-(627+73)
=1200-700
=500 (3)原式=625+75+(49+51)
=700+100
=800
(4)原式=657+43-(68+132)
=700-200
=500 (5)原式= 468-68-(62+38)
= 400-100
=300 (6)原式=210+(115+523)-438
=210+638-438
= 410