-89-899-8999-89999-899999
=-(90-1)-(900-1)-(9000-1)-(90000-1)-(900000-1)
=-90+1-900+1-9000+1-90000+1-900000+1
=-90-900-9000-90000-900000+5
=-999990+5
=-999985
~师范附小李为您解答~
~如果您满意请按下采纳,您的采纳是我前进的动力~
-89-899-8999-89999-899999
=-(90-1)-(900-1)-(9000-1)-(90000-1)-(900000-1)
=-90+1-900+1-9000+1-90000+1-900000+1
=-90-900-9000-90000-900000+5
=-999990+5
=-999985
~师范附小李为您解答~
~如果您满意请按下采纳,您的采纳是我前进的动力~