1)х=8/21 :2/3
х=8/21 х 3/2
х=4/7
2)15/7у=2и4/9+5/9
15/7у=3
у=3:15/7
у=3 х 7/15
у=7/5=1и2/5
3) (5/14-1/3+1/7)н=1/4
(15/42-14/42+6/42)н=1/4
7/42н=1/4
1/6н=1/4
н=1/4 :1/6
н=1/4 х6
н=3/2=1и1/2
3764+х=7006
х=7006-3764
х=3242
у-865=3572
у=3572+865
у=4437
6061-z=785
z=6061-785
z=5276
k+429=8005
k=8005-429
k=7576
(m-4789)+89=6004
<span>(m-4789)=6004-89
</span><span>(m-4789)=5915
</span>m=5915+4789
m=10704
2732+(5000-n)=4803
5000-n=4803-2732
5000-n=2071
n=5000-2071
n=2929
(p+7245)-3834=6357
p+7245=6357+3834
p+7245=10191
p=10191-7245
p=2946
8113-(10101-r)=5207
10101-r=8113-5207
10101-r=2906
r=10101-2906
r=7195