а) -1/4+7/12в+1/4=-1/6в-5/12+в
7/12в+1/6в-в=-5/12
7/12в+2/12в-12/12в=-5/12
-3/12в=-5/12
в = -5/12 / -3/12
в = -5/12*-12/3
в = 5/3 = 1 2/3
б) 8-1/5 = 8k+1/4k
39/5 = 33/4k
k = 39/5 / 33/4
k = 39/5 * 4/33
k = 156/165
k = 52/55
c) 2/3d=11-0,19/0,07
2/3d=11-19/100*100/7
2/3d=77/7-19/7
2/3d=58/7
d= 58/7 / 2/3
d= 58/7*3/2
d=87/7
d=12 3/7
а) -1/4+7/12в+1/4=-1/6в-5/12+в
7/12в+1/6в-в=-5/12
7/12в+2/12в-12/12в=-5/12
-3/12в=-5/12
в = -5/12 / -3/12
в = -5/12*-12/3
в = 5/3 = 1 2/3
б) 8-1/5 = 8k+1/4k
39/5 = 33/4k
k = 39/5 / 33/4
k = 39/5 * 4/33
k = 156/165
k = 52/55
c) 2/3d=11-0,19/0,07
2/3d=11-19/100*100/7
2/3d=77/7-19/7
2/3d=58/7
d= 58/7 / 2/3
d= 58/7*3/2
d=87/7
d=12 3/7