A) 17 ÷ 17/9 = 153/17 = 9
б) 1 1/14 ÷ 1 2/7 = 15/14 ÷ 9/7 = 105/126 = 5/6
в) 2 1/3×3 1/5-8 4/9÷2 = 7/3 × 16/5 - 76/9 ÷ 2 = 112/15 -76/18 = 672/90 - 380/90 = 292/90 = 146/45 = 3 11/45
г) 5 2/7×1 1/4+5 2/7×1 3/4 = 37/7 × 5/4 + 37/7 × 7/4 = 185/28 + 259/28 = 444/28 = 111/7 = 15 6/7
д) 15 23/24×17 11/16-11 16/27×17 11/16-4 7/27×16 11/16 = 383/24 × 283/16 - 313/27 × 283/16 - 115/27 × 267/16 = 266869/3456 - 30705/432 = 266869/3456 - 245640/3456 = 21229/3456 = 6 493/3456