0.4÷0.2= 1÷= 406﹣299= a﹣a×0=
①338﹣338÷26×12
②102.7×3.4+102.7×6.6
③
④×[+(﹣75%)]
=232+418+182
=232+600
=832( )
改正:
=46+454+137+563
= 500+700
= 1200( )