-15+(-16)+20+8=-15-16+20+8=-31+20+8=-11+8=-3
Q = (3/128)/(3/156) = 3*256/128*3 = 2
b15 = b3 * q^12 = 3/64 * 2^12= 3/64 * 4096 =192
А) 1/4+3/8*5/3=1\4+5/8=1*2/8+5/8=7/8
б)7/6*3\14-1\10=3/4-1\10=3*5/20-2\20=13/20
в0 19/6*3/14-4=19/14-4=-4+1 5/14=-2 9/14