帮忙出20道20以内的加减法，出比较经典的！谢谢了

4 + 11 = 15; 16 - 13 = 3
4 + 5 = 9; 20 - 6 = 14
8 + 14 = 22; 6 - 5 = 1
18 + 11 = 29; 10 - 5 = 5
2 + 7 = 9; 20 - 12 = 8
8 + 12 = 20; 13 - 5 = 8
8 + 10 = 18; 4 - 2 = 2
11 + 3 = 14; 14 - 8 = 6
13 + 6 = 19; 12 - 5 = 7
11 + 20 = 31; 14 - 5 = 9
7 + 7 = 14; 5 - 5 = 0
19 + 11 = 30; 10 - 10 = 0
17 + 3 = 20; 17 - 6 = 11
12 + 18 = 30; 18 - 3 = 15
4 + 10 = 14; 6 - 2 = 4
15 + 18 = 33; 18 - 2 = 16
1 + 13 = 14; 8 - 3 = 5
15 + 6 = 21; 16 - 15 = 1
12 + 9 = 21; 10 - 5 = 5
4 + 10 = 14; 11 - 1 = 10

16+17 12+14 14+13 12+11 10+15 11+12 13+17 15+11 11+11 18+12 20－11 18－11 14－7 16－8 12－6 18－9 15－8 17－9 13－6 17－8