0.37+0.73=
2.5÷0.05=
0.15×4=
÷3=
×1 =
1.2× =
45×20%=
÷ =
﹣ =
9.3﹣3.9=
①16.8﹣7.2﹣6.8
② × + ×
③ ÷[( - )× ]