(6.125-2.75)-(1.25-0.875)=(6.125+0.875)-(1.25+2.75)=7-4=3
你可以拆括号,变成: 6.125-2.75-1.25+0.875 再移项:(6.125+0.875)-(2.75+1.25)=7-4=3
(6.125-2.75)-(1.25-0.875)=(6.125+0.875)-(2.75+1.25)=7-4=3
6.125+0.875-(2.75+1.25)=7-4=3