20000-2888888888+2999999999=111131111
20000-2888888888+2999999999=111131111
20000 - 2888888888 + 2999999999 = 111131111
20000-2888888888+2999999999=1111311111
20000 - 2888888888+ 2999999999
= 20000 + ( - 2888888888 ) + 2999999999
= (-2888868888 ) + 2999999999
= 111131111
Vậy : 20000 - 2888888888+ 2999999999 = 111131111
20000+2888888888+2999999999=111131111
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