9.2﹣7.3=
8.5÷0.5=
1.2×0.6=
350+160=
+ =
﹣ =
× =
÷6=
①3.68﹣0.82﹣0.18
②22.5×0.48+77.5×0.48
③36×( + )
④3 ﹣ + ﹣ .