(106² - 121) / (122² - 64) = (106² - 11²) / (122² - 8²) = (106 - 11)(106 + 11) / (122 - 8)(122 + 8) = 95*117 / (114*130) =
разложим на простые множители
95 = 5*19
117 = 3*3*13
114 = 2*3*19
130 = 2*5*13
= 5*19 * 3*3*13 / (2*3*19 * 2*5*13) = 5 * 3*3 / (2*3 *2*5) = 3/4
