67.3-(17.6+15.38)
31.9-3.09=
×÷×=
1.7×101=
+=
50%+30%=
3.14÷0.5÷2=
:=
(+)×24=
+0.375=
0.2²=
910÷70=
12-2=
()×24=
×11=
÷5=
1-×2=
25×4%=
=