(1 / 8 + 0,875) × 3,45 + 6 / 15

(1/8 + 0,875) * 3,45 + 6/15 = 3 51/60,1) 1/8 + 0,875 = 0,125 + 0,875 = 1,(или1) 1/8 + 0,875 = 1/8 + 875/1000 = 1/8 + 7/8 = 8/8 = 1),2) 1 * 3,45 = 3,45,3) 3,45 + 6/15 = 3 45/100 + 6/15 = 3 9/20 + 6/15 = 3 27/60 + 24/60 = 3 51/60