四年级上册小学生89×5怎样简便计算
89×5
=（90-1）×5
=90×5-1×5
=450-5
=445
=（90-1）×5
=90×5-1×5
=450-5
=445
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第1个回答 2016-12-27
89×5
= 90×5 - 5
= 450 - 5
= 445
= 90×5 - 5
= 450 - 5
= 445
