Выполните действие в скобках и сократите дроби

1) (111+172) * 89 / (111+182) * 89

2) (241-230) - (487+222) / (499-468) * (1000-291)

3) (2000-1993) * (1011-789) / (2008-1989) * (139+83)

1)

(111+172) * 89 / (111+182) * 89 =

= 283*89 / 293*89 = 283/293

2)

(241-230) * (487+222) / (499-468) * (1000-291) =

= 11*709 / 31*709 = 11/31,

3)

= (2000-1993) * (1011-789) / (2008-1989) * (139+83) =

= 7*222 / 19*222 = 7/19