+= ﹣= 3.5×= 2÷0.5=
+80%× ÷× [×(4-)]÷
0×5.16= 9.8+2.6= 502-399=
÷4= × = 20×5=
14.3﹣6.8=
0.25×8=
0.33-0.303=
0.125×=
2.4÷0.06=
6a×9a=
÷12=
1-+=
口诀: