67﹣40=
15×6=
3.5÷7=
16+25=
-=
÷=
×21=
+=
2023﹣55=
12.8+8.21=
1.4×5=
30×120=
×=
÷=
5﹣2=
×4÷×4=
①16.8﹣7.2﹣6.8
② × + ×
③ ÷[( - )× ]