Точно=5 км 743 м
Приблизительно=6 км
3 * 2 = 6
7 = 7
3 * 3 = 9
2 * 2 * 2 = 8
a = 6*7*8*9
63/1=63
(40+40+64)/3=48
(70+4+67+97)/4=59,5
3/7 * 7/ 9 =( 3*7)/(7*9)=1/3
...=15/7 * 28/9 =(15*28)/(7*9)=( 5*4)/ =20/3=6 2/3
...= 5/8 * 28/15 * 16/ 7=(5*28*16)/(8*15*7)= ( 4*2 )/3= 8/3=2 2/3
17/34 * (5-5 4/5 * 1 1/9 )= 1/2 * (5-(24*10)/(5*9))= 1/2 * (5- 16/3)= 1/2 * (5-5 1/3)=1/2*(-1/3)=-1/6