Question

-2 1/9-(-4 2/11+1 8/9)

Answer 1

(-42/11+18/9=-42*9/11*9+18*11/9*11=-378/99+198/99=(-180/99))-21*11/9*11 = -221/99-(-180/99)=-221/99+180/99 = -41/99 .Отв.:-17/33. -17/33 рациональное число.