如题所述
第1个回答 2020-06-07
解:原式=5.45-0.45+2.57
=5+2.57
=7.57.
=5+2.57
=7.57.
第2个回答 2020-06-07
5.45+2.57-0.45
=(5.45-0.45)+2.57
=5+2.57
=7.57
=(5.45-0.45)+2.57
=5+2.57
=7.57
第3个回答 2020-06-07
5.45+2.57-0.45
=5.45-0.45+2.57
=5+2.57
=7.57
望采纳,谢谢
=5.45-0.45+2.57
=5+2.57
=7.57
望采纳,谢谢