20-4.57+6.85简便运算怎么算?

分类: 作业答案 • 2022-02-19 13:51:23

问题描述：

答

=20-4.57+(4.57+2.28)
=20+2.28
=22.28

答

20-4.57+6.85
=20+6.85-4.57
=20+6.85-(4.6-0.03)
=20+6.85-4.6+0.03
=20+2.25+0.03
=20+2.28
=22.28

答

20-4.57+6.85
=20-4+6+0.85-0.57
=22+0.28
=22.28