9/56-(7/15-5/12)×(3/14+1/2);
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=5/140=1/28 4)9/56-1/28=9/56-2/56=7/56=1/8=0,125