Вычислите 5/8 - 3/4, 4/7 • 14/15, 20/27:5/6

▪5/8 - 3/4 = 5/8 - 6/8= -1/8▪4/7 • 14/15 = (4×14)/(7×15) = (4×2)/15 = 8/15▪20/27:5/6 = 20/27 × 6/5 = (4×2)/9 = 8/9