Решите плз. Срочно плз.
1) (5/7)*2 = 10/14
1/2 * 7 = 7/14
10/14 - 7/14 = 3/14
2) 4/5 * 2 = 8/10
3/10-8/10= -5/10 = -1/2 = -0.5