П.4 Вычислите: 1) 11 · 1 17/55 - 15,3; 2) 3 4/7 · 4,5 · 7/35 · 8,75 : 2/5 : 9/32; 3) 19 · 2 55/76 - 39,4; 4) 6,8 · 5/13 · 2,7 · 3 3/25 : 5 2/5 : 1/175.

1) 11 * (1 + 17/55) - 15.3 = 11 * (72/55) - 15.3 = 792/55 - 15.3 = 14.4 - 15.3 = -0.9.
2) (25/7) * (9/2) * (7/35) * (35/4) * (5/2) * (32/9) = (25/7) * (9/2) * (1/5) * (35/4) * (5/2) * (32/9) = 25 * 35 * 32 / (7 * 2 * 5 * 4 * 2 * 9) = 28000 / 2520 = 11.11.
3) 19 * (2 + 55/76) - 39.4 = 19 * (152/76 + 55/76) - 39.4 = 19 * (207/76) - 39.4 = 3933/76 - 39.4 = 51.75 - 39.4 = 12.35.
4) (68/10) * (5/13) * (27/10) * (78/25) / (27/5) / (1/175) = (34/5) * (5/13) * (27/10) * (78/25) * (5/27) * 175 = (34/13) * (27/10) * (78/25) * (5/27) * 175 = (34/13) * (78/10) * (5/25) * 175 = (34/13) * (39/5) * (1/5) * 175 = (34 * 39 * 175) / (13 * 5 * 5) = 232050 / 325 = 714.