91*2/5:5/6+3,48:6,25*1,8=

91 * 2/5 : 5/6 + 3,48 : 6,25 * 1,8 = 91 * 2/5 * 6/5 + 348/100 : 625/100 * 18/10 = 91 * 2/5 * 6/5 + 87/25 * 4/25 * 18/10 = (91 * 2 * 6) / (5 * 5) + (87 * 4 * 18) / (25 * 25 * 10) = 1092/25 + 3132/3125 = 136500/3125 + 3132/3125 = (136500 + 3132) / 3125 = 139632/3125 = 44,68224.