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3 2/11 x (6 5/21 - 1 11/21)=3²/₁₁ x (5²⁶/₂₁-1¹¹/₂₁)=3²/₁₁ x 4¹⁵/₂₁=
=³⁵/₁₁ x ⁹⁹/₂₁=⁵/₁ x⁹/₃=5x3=15
5 1/2 x (1,5)DO POTEGI 2 - 4 5/7 : 1 1/21=
5,5 x 2,25 -³³/₇:²²/₂₁=12,375 - ³³/₇ x ²¹/₂₂=12,375 -⁹/₂=
=12,375 -4,5=7,875