计算-89-899-8999-89999-899999

3个回答

  • -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

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