помогите скорей, хелп

Пошаговое объяснение:

1) 10/15 * 1 1/2 = 2/3 * 3/2 = 1/1 * 1/1 = 1/1 = 1

2) 12/9 * 6/18 * 1/4 = 4/3 * 1/3 * 1/4 = (4*1*1)/(3*3*4) = 4/36 = 1/9

3) 111/370 = (111:37)/(370:37) = 3/10

4) (316 - 27)/27 * 9/10 = 289/27 * 9/10 = 289/3 * 1/10 = 289/30 = 9 19/30