1 590/999+5 (98/99)* (87 731/999)=1 590/999+(6-1/99)(88-268/999)=
=1 590/999+528+268/99*999-8/9-1608/999=
=1+590/999+528-1-609/999+268/99*999-8/9=
=528+590/999-609/999-888/999+268/99*999=
=528-907/999+268/99*999=528-89525/98901=527 9376/98901
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1 590/999+5 (98/99)* (87 731/999)=1 590/999+(6-1/99)(88-268/999)=
=1 590/999+528+268/99*999-8/9-1608/999=
=1+590/999+528-1-609/999+268/99*999-8/9=
=528+590/999-609/999-888/999+268/99*999=
=528-907/999+268/99*999=528-89525/98901=527 9376/98901