X - 6 + x + 19 = 50
2x - 6 + 19 = 50
2x = 50 + 6 - 19
2x = 37
x = 37: 2
x = 18,5
Vot eto otvet s=25
k=1.5
saod=9
saob=scod=6
sboc=4
sabcd=6+6+9+4=25
2,8+300-15*(6,125+3,1)=164,425
1) 6,125+3,1=9,225
2) 15*9,225=138,375
3) 2,8+300=302,8
4) 302,8-138,375=164,425
1) 5а-0,7а-8=4,3а-8
2)9,6b+7-0.4b=9.2b+7
3)-5c+13-6с=-11с+13
4)20-15х+8х=20-23х
5)8у+20-11у=-3у+20
6)6х-3х+21=3х+21