①286+54=
②657-312=
③*367+533=
④880-407=
⑤304-195=
⑥*634-182=
⑦325+256-127=
⑧850-(365+248)=
⑨1000-324-275=
674+(312﹣198)=
1000﹣764﹣187=
176+432+230=
87+543﹣278=