8一4.56十2.44十1.5怎样简便计算
问题描述:
8一4.56十2.44十1.5怎样简便计算
答
8-4.56+2.44+1.5
=8-(4.56-2.44)+1.5
=8-2.12+1.5
=9.5-2.12
=7.38