× =
6﹣4.92=
25×0.7×4=
+0.5=
3- =
6.3÷0.21=
1﹣1÷ =
(0.6- )×16=
3.6÷0.4=
=
401÷50≈
30%×90=
0.32=
36个
19个
?个