3.98+2=
÷ =
3.6× =
+ =
1÷20%=
20×5.5=
﹣ =
0.23=
× =
2.5×12=
①4×(250-400÷16)
②5.5÷×
③3.6×+6.4×
④7-7×+
⑤+4.9++5.1
⑥(-0.8+)×12.5