①35+27=
②53-(4+28)=
③46+24-19=
④72+(25-17)=
①82+9-53=
②89-34-18=
③90-36+15=
④28+37-16=
⑤12+48+36=
⑥45-19+18=
①36+16 =
②50-29=
③74-39 =
④63-45+21=
⑤80-18-26=