3511﹣399=
4.97+5.3=
2.5×1.6=
1.9×5.1≈
31.9÷8.1≈
0.32﹣0.23=
÷2=
14÷=
+6÷30 =
1×=
0÷=
①
②
③
④
⑤
⑥
⑦
⑧
×15= ×2= × = × =
÷ = ÷3= ÷5= ÷ =
×3= ×= ×= ÷= (+)×15=
÷2= ÷= ÷= ×= 12÷(1-)=
0.37+1.8=
0.25×8=
5.1÷0.3=
1-7÷7=
1.25×4×8=
6.2-2.15