原式=(10-1)+(20-1)+(200-1)+(2000-1)+(20000-1)
=10+20+200+2000+20000-5
=22225
19999+1999+199+19+4
=19999+1999+199+19+(1+1+1+1)
=(19999+1)+(1999+1)+(199+1)+(19+1)
=20000+2000+200+20
=22220
9+19+199+1999+19999
=10-1+20-1+200-1+2000-1+20000-1
=22230-5
=22225
10+20+200+2000+20000-5=22225
9十19十199+1999+19999
=(9+1)+(19+1 )+(199+1)+(1999+1)+(19999+1)-5
=10+20+200+2000+20000-5
=22230-5=22225
求采纳