Oblicz (7 - 5 2/5) * 1/4 = (7/9 - 47/72) : 1 1/4 = 6 * (1 1/3) do potęgi drugiej = (5/7) do potęgi drugiej : 5/7 = ( 1/3 - 1/4) do potęgi drugiej = (2/5) do potęgi drugiej + 4 1/2 * 2 2/3 = 5 * ( 1/2) do potęgi drugiej + 15 * (1/3) do potęgi drugie

(7 - 5 i 2/5) · 1/4 = (6 i 5/5 - 5 i 2/5) · 1/4 = 1 i 3/5 · 1/4 = 8/5 · 1/4 = 2/5  (7/9 - 47/72) : 1 i 1/4 = (56/72 - 47/72) : 5/4 = 9/72 : 5/4 = 1/8 · 4/5 = 1/10 6 ·(1 i 1/3)² = 6 ·(4/3)² = 6 · 16/9 = 32/3 = 10 i 2/3 (5/7)² : 5/7 = 25/49 · 7/5 = 5/7 (1/3 - 1/4)² = (4/12 - 3/12)² = (1/12)² = 1/144 (2/5)² +4 i 1/2 · 2 i 2/3 = 4/25 +9/2 · 8/3 = 4/25 +12 = 12 i 4/5 5 ·(1/2)² +15 ·(1/3)² = 5 · 1/4 +15 · 1/9 = 5/4 +15/9 = 5/4 +5/3 = = 15/12 +20/12 = 35/12 = 2 i 11/12 1/9 -(5/6 - 2/3)² = 1/9 -(5/6 - 4/6)² = 1/9 -(1/6)² = 1/9 - 1/36 = 4/36 - 1/36 = = 3/36 = 1/12

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