1000道20以内小学算术题（单运算）

10-7 =14-7 =14 + 1 =9-3 =+ 14 =16-15 =+ 10 =17-1 =6 + 4 =12-12 =11-4 =20-8 =9 + 1 =13-1 =15 -14 =14-