2 1/7 : 1,5 а= 5/14:0,8
15/7 : 1,5 а =5/14 *10/8 5*10/14*8=5*5/7*8=25/56
15/7:1,5 а = 25/56
1,5а= 15/7 : 25/56
1,5а= 15/7*56/25 15*56 /7*25=3*56/7*5=3*8/1*5=24/5
1,5а= 3*8 / 1*5
1,5 * а =24/5
а= 24/5 :1 5/10 24/5:15/10=24*10/5*15=24*2/15=48/15=3,2
а=3,2
Проверка 2 1/7 : 1,5*3,2= 5/14:0,8
15/7:4,8=5/14:0,8
15/7* 10/48 = 5/14*10/8
15/7*5/24 =(5*5 ) / (7*8)
75/168 = 25/56
25/56=25/56