=4/3*3/7+4/7*4/3=7/7+4/7*4/3=4/7(1+4/3)=4/7*7/3=4/3=1.1/3
1 1/3 *3/7+4/7*1 1/3 = 4/3 *(3/7+4/7)=4/3* 7/7 = 28/21 = 4/3=1 целая1/3
=4/3*3/7+4/7*4/3=7/7+4/7*4/3=4/7(1+4/3)=4/7*7/3=4/3=1.1/3
1 1/3 *3/7+4/7*1 1/3 = 4/3 *(3/7+4/7)=4/3* 7/7 = 28/21 = 4/3=1 целая1/3