⑴0.12:0.3 ⑵1:⑶38:190 ⑷
+=
=
×30= ÷ = + = ÷ = 0× =
3.2÷0.4= 5- = × = 1.21× = ÷2.2=
①135:90
②0.125:
③16分:时
④:60%
甲店:打八折销售
乙店:购物每满200元,返现金30元