1.выполните действие пожалуйста а.9/59-(7/15-5/12)*(3/14+1/2) б.(2/3+7/8-5/6)*(1-5/17) в.(3 1/14-2 5/21)*(2.7-2.1) г.(4

9/59-(7/15-5/12)*(3/14+1/2)=9/59-3/60 *10/14=9/59-1/28=193/1652(2/3+7/8-5/6)*(1-5/17) =17/24*12/17=1/2(3 1/14-2 5/21)*(2.7-2.1)=5/6*6/10=1/2(4 13/18-3 7/9)*(1/2-4/17)=17/18 *9/34=1/42/5*1/2=1/52/5*2/5=4/252/5 *2 1/2=12/5*1 7/8=46/40= 1 3/202/5*15/16=3/8