67×48+53×67-67怎简便计算 46×78+78×39-85×58怎简便计算
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/28 21:11:29
67×48+53×67-67怎简便计算 46×78+78×39-85×58怎简便计算
67×48+53×67-67
=67×48+53×67-67×1
=67×(48+53-1)
=67×100
=6700
46×78+78×39-85×58
=78×(46+39)-85×58
=78×85-85×58
=85×(78-58)
=85×20
=1700
=67×48+53×67-67×1
=67×(48+53-1)
=67×100
=6700
46×78+78×39-85×58
=78×(46+39)-85×58
=78×85-85×58
=85×(78-58)
=85×20
=1700
67×48+53×67-67怎简便计算 46×78+78×39-85×58怎简便计算
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