4 8/9 + 6 7/8 :( 5 11/12 -3 5/6) х 1 2/3
5 11/12-3 5/6=71/12-23/6=71/12-46/12=25/12 6 7/8÷25/12=55/8×12/25=33/10 33/10×1 2/3=33/10×5/3=11/2 4 8/9+11/2=44/9+11/2=88/18+99/18=187/18= =10 7/18