①70-47=
②38+47=
③63-28=
④53+46-24=
⑤72-34-27=
⑥100-(35+38)=
①45+37=
②73-45=
③18+27+30=
④12+79-36=
⑤76-35-28=
⑥80-(34+15)=
①
②
③