2.5×2=
1﹣0.75=
12× =
+2=
1.6÷0.4=
+ =
63+ =
125%×8=
4.6+5.04=
0.6²=
① ×( ﹣ )
② + +
③( + )÷ ×
④13﹣3+5﹣
①2x+5.4=8.6
②4.5x+ x=70
③2.1:x=70%
④ :12= :x