rogov23rus А)9/8*4/3=3/2=1,5
б)18/5*10/27=4/3=1целая 1/3
в)31/7*7-11/6*3=31-5,5=25,5

Nastya171167 А)1 1/8  : 3/4 = 9/8 : 3/4 = 9/8 *  4/3 = 36/24 =  3/2 = 1 1/2
б)3 3/5 : 2 7/10 = 18/5 :  27/10 = 18/5  *  10/27 = 180/135 =  4/3 = 1 1/3
в)4 3/7  :  1/7  -  1 5/6  *  3 = 31/7 :  1/7  -  11/6  *  3 = 31/7  *  7  -  11/6 * 3 = 31  -  11/6 * 3 = 31  -  11/2 = (31 × 2  -  11 × 1)/2 = 62/2  -  11/2 =  51/2 = 25 1/2