1) решите уравнения (x*6): 8=80 2) 786-(x-273)=129 3) 34*x-12=280 4) 2400: (317+x)=3

(X*6):8=80
6x:8=80
6x=80*8
6x=640
x=640:6
x= 106.6

786-(x-273)=129
786-x+273=129
-x=129-1059
-x=-930
x=930

34*x-12=280
34x=280+12
34x=292
x=8.6

2400:(317+x)=3
317+x=2400/3
317+x=800
x= 800-317
x=483