(1/3)^-1=3
(-6/7)^6=6^6/7^6
(1/2)^2=1/4
3-2=1
1+1/4-6^6/7^6=
1.25-46656/117649
6х2-3х=0
12-3х=0
-3х=0-12
-3х=-12 | : (-3)
х=4
ответ : 4
5/6+3/8=20/24+9/24=29/24=1 5/24
5/9-5/12=29/36-15/36=14/36
7/12-7/20=35/60-21/60=14/60
5/42+10/63=15/126+20/126=35/126
5/24 +7/60=25/120+14/120=39/120
3/4*5/7=15/28
1/8*12=1/8*12/1=12/8