5/7+19/25x4+21/25x19

分类: 作业答案 • 2022-05-03 13:53:02

问题描述：

答

5/7+19/25x4+21/25x19
=5/7+4/25×19+21/25×19
=5/7+19×(4/25+21/25)
=5/7+19×1
=5/7+19
=19又5/7