Сократите: 12*21/35*15; 72*11/33*30; 25*17*44/51*8*75; 8*3+8*23/3*16; 17*48/17*16-9*16; 14*5-14*3/21*9+21*3

а) 12 * 21/35 * 15 = 108.

12 * 21/35 = (12 * 21) / 35 = 252/35 (сокращаем на 7) = 36/5.

36/5 * 15 = (36 * 15) / 5 = 540/5 = 108.

б) 72 * 11/33 * 30 = 720.

72 * 11/33 = (72 * 11) / 33 = 792/33 = 24.

24 * 30 = 720.

в) 25 * 17 * 44/51 * 8 * 75 = 220000.

25 * 17 = 425.

425 * 44/51 = (425 * 44) / 51 = 18700/51 (сокращаем на 17) = 1100/3.

8 * 75 = 600.

1100/3 * 600 = (1100 * 600) / 3 = 660000/3 = 220000.

г) 8 * 3 + 8 * 23/3 + 16 = 101 1/3.

8 * 3 = 24.

8 * 23/3 = (8 * 23) / 3 = 184/3.

24 + 184/3 + 16 = (72 + 184 + 48) / 3 = 304/3 = 101 1/3.

д) 17 * 48/17 * 16 - 9 * 16 = 624.

17 * 48/17 * 16 = (17 * 48 * 16) / 17 = 13056/17 = 768.

9 * 16 = 144.

768 - 144 = 624.

е) 14 * 5 - 14 * 3/21 * 9 + 21 * 3 = 115.

14 * 5 = 70.

21 * 3 = 63.

14 * 3/21 * 9 = (14 * 3 * 9) / 21 = 378/21 = 18.

70 - 18 + 63 = 115.