5个数字的减法题目.会吗?

每种4个算式:

111-11=100,1111-1=1110,111-1-1=109,11-1-1-1=8

222-22=200,2222-2=2220,222-2-2=218,22-2-2-2=16

333-33=300,3333-3=3330,333-3-3=327,33-3-3-3=24

444-44=400,4444-4=4440,444-4-4=436,44-4-4-4=32

555-55=500,5555-5=5550,555-5-5=545,55-5-5-5=40

666-66=600,6666-6=6660,666-6-6=654,66-6-6-6=48

777-77=700,7777-7=7770,777-7-7=763,77-7-7-7=56

888-88=800,8888-8=8880,888-8-8=872,88-8-8-8=64

999-99=900,9999-9=9990,999-9-9=981,99-9-9-9=72