999+9999+9999*9999+99999/99999
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999+9999+9999*9999+99999/99999999+9999+9999*9999+99999/99999999+9999+9999*9999+99999/99999原式=1000-1+
999+9999+9999*9999+99999/99999
999+9999+9999*9999+99999/99999
999+9999+9999*9999+99999/99999
原式=1000-1+10000-1+(10000-1)(10000-1)+1
=11000-1+10000×(10000-1)-1×(10000-1)
=11000-1+99990000-9999
=11000-10000+99990000
=99991000
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