Вправи для повторення за рік » 947

Обчисли значення виразу: а) 101/4 – (77/12 – 21/4) : (53/5 – 11/3) = 101/4 – (77/12 – 23/12) : (59/15 – 15/15) = 101/4 – 51/3 : 44/15 = 101/4 – 16/3 • 15/64 = 101/4 – 5/4 = 9; б) (11/3 + 25/12) • (31/5 + 67/15 – 52/3) = (14/12 + 25/12) • (33/15 + 67/15 – 510/15) = 33/4 • 4 = 9; в) 3/10 : 11/2 + (45/12 + 313/24 – 65/6) • 13/5 = 3/10 • 2/3 + (410/24 + 313/24 – 620/24) • 13/5 = 1/5 + 11/8 • 13/5 = 1/5 + 9/8 • 8/5 = 1/5 + 9/5 = 2; г) 11/35 : 3/5 + (75/7 : 33/5 – 6/7) = 36/35 • 5/3 + (54/7 • 5/18 – 6/7) = 12/7 + (15/7 – 6/7) = 12/7 + 9/7 = 21/7 = 3; ґ) (22/3 : 2/9 – 52/3) • 11/38 + 13/5 • 5/16 = (8/3 • 9/2 – 52/3) • 39/38 + 8/5 • 5/16 = (12 – 52/3) • 39/38 + 1/2 = 61/3 • 39/38 + 1/2 = 19/3 • 39/38 + 1/2 = 13/2 + 1/2 = 7; д) 22/5 • (84/9 : 34/5 + 11/2 • 5/27) = 12/5 • (76/9 • 5/19 + 3/2 • 5/27) = 12/5 • (20/9 + 15/54) = 12/5 • (120/54 + 15/54) = 12/5 • 135/54 = 54/9 = 6.