写作:
32÷8=
83-71=
6×6=
30÷5=
16÷4÷4=
38+2-30=
81÷9-9=
2+5×3=
①23÷5=
②54÷9=
③★254+537=
④★601-298=
+1 ÷1 8.99×9.9990