38+29+30 87-30-42 68-(46-24)
①39+36+8=
②98-36-47=
③100-9-28=
④76-57+32=
⑤58+24-49=
⑥56-(9+38)=
①1.25×3.2×2.5
②×[0.75﹣()]
③×()
④2022×
⑤55×102+646÷38