算19+199+1999+19999
问题描述:
算19+199+1999+19999
答
22116
答
20+200+2000+20000-1-1-1-1=22216
答
19+199+1999+19999
=20-1+200-1+2000-1+20000-1
=22220-4
=22216
答
20+200+2000+20000-4
=22216