289x72-89x72怎么简便计算?
发布网友
发布时间:2022-05-30 03:41
我来回答
共2个回答
热心网友
时间:2023-08-05 02:39
①289×72-89×72
=(200+89)×72
-89×72
=200×72+89×72
-89×72
=72(200+89-89)
=72×200
=14400
②289×73-89×72
=289(1+72)
-89×72
=289+(200+89)
×72-89×72
=289+200×72
+(89×72)
-(89×72)
=289+200×72
=289+14400
=14689
热心网友
时间:2023-08-05 02:39
(289-89)×72
=200×72
=14400