Математика 6 класс учебник Виленкин, Жохов 1 часть ответы – номер 2.165

а) 5⁽⁵/6 – 5⁽³/10 = 25/30 – 15/30 = 10/30 = 1/3 б) 3⁽⁷/20 – 3⁽⁵/28 = 21/140 – 15/140 = 6/140 = 3/70     20 = 2 · 2 · 5 и 28 = 2 · 2 · 7     НОК (20, 28) = 2 · 2 · 5 · 7 = 20 · 7 = 140 в) 3⁽⁷/4 – 1⁽²/14 = 21/28 – 2/28 = 19/28 г) 7⁽¹³/15 – 2⁽⁵/39 = 91/195 – 10/195 = 81/195 = 27 · ̶3̶/65 · ̶3̶ = 27/65     15 = 3 · 5 и 39 = 3 · 13     НОК (15, 39) = 3 · 5 · 13 = 15 · 13 = 195 д) 26⁽⁴/33 – 7⁽³/44 = 104/132 – 21/132 = 83/132 е) 11⁽²/21 – 3⁽³/14 = 22/42 – 9/42 = 13/42 ж) 9⁽¹³/22 – 7⁽¹¹/26 = 117/286 – 77/286 = 40/286 = 20/143     22 = 2 · 11 и 26 = 2 · 13     НОК (22, 26) = 2 · 11 · 13 = 22 · 13 = 286 з) 33⁽³/40 – 7⁽⁸/15 = 99/120 – 56/120 = 43/120     40 = 2 · 2 · 2 · 5 и 15 = 3 · 5     НОК (40, 15) = 2 · 2 · 2 · 5 · 3 = 40 · 3 = 120