简便方法计算18.36-2.25+1.64-4.75=还有5.36-2.78-2.36全部简便方法计算!_数学解答

简便方法计算18.36-2.25+1.64-4.75=
还有
5.36-2.78-2.36
全部简便方法计算!

人气：271 ℃　时间：2020-03-27 12:43:24

解答

18.36-2.25+1.64-4.75
=18.36+1.64-(2.25+4.75)
=20-7
=13
5.36-2.78-2.36
=5.36-2.36-2.78
=3-2.78
=0.22