<span>9/56 -(7/15-5/12)*(3/14+1/2)=1/8</span>
<span>1) 7/15-5/12=28/60-25/60=3/60=1/20</span>
<span>2) 3/14+1/2=3/14+7/14=10/14=5/7</span>
<span>3) 1/20*5/7=1/28</span>
<span>4) 9/56-1/28=9/56-2/56=7/56=1/8</span>
1) 89653+13348=103001
2) 960157-38998=921159
3) а • 78985
а = 22
22 • 78985=1737670
4) 189528:b
b = 12
189528:12=15794