А)9/56-(7/15-5/12)*(3/14+1/2)=

Question

А)9/56-(7/15-5/12)*(3/14+1/2)=

Answer 1

А) 9/56 - (7/15 - 5/12) * (3/14 + 1/2) = 1/8

1) 7/15 - 5/12 = 28/60 - 25/60 = 3/60 = 1/20
2) 3/14 + 1/2 = 3/14 + 7/14 = 10/14 = 5/7
3) 1/20 * 5/7 = (1*1)/(4*7) = 1/28
4) 9/56 - 1/28 = 9/56 - 2/56 = 7/56 = 1/8