489x107一489的简便计算?
发布网友
发布时间:2022-05-07 02:47
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热心网友
时间:2023-08-24 11:38
解:
489×107-489
=489×(107-1)
=489×106
=489×(100+6)
=489×100+489×6
=48900+2934
=51834
热心网友
时间:2023-08-24 11:39
489×107-489=51834
热心网友
时间:2023-08-24 11:39
①首先,读题可知题中有个共同数489
②然后,把489提出来得:
489×(107-1)
=489×106
=51834
热心网友
时间:2023-08-24 11:40
简便计算方法:
489×107-489
=489×(107-1)
=489×106
=489×(100+6)
=489×100+489×6
=48900+2934
=51834
热心网友
时间:2023-08-24 11:40
489*107-489
=489*(107-1)
=489*106
=(490-1)*(100+6)
=490*100+490*6-106
=49000+2940-106
=49000+2834
=51834