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wykonujac dzialania na ulamkach.musimy sprowadzic do wspolnego mianownika dla 3 i 8 to 24
17*( 16/24 - 21/24) - 4/9 + 2 1/2=
=17*(- 5/24) - 8/18 + 2 9/18=
= - 85/24 + 2 1/18=
wspolny mianownik dla 24 i 18..to 72
= - 255/72 + 2 4/72 =
- 3 39/72 + 2 4/72 = - 1 35/72