7 . (x-14)+35= 25+279:9
7 . (x-14)+35= 25+31
7 . (x-14)+35= 56
7 . (x-14)= 56-35
7 . (x-14)= 21
x-14= 21:7
x-14= 3
x= 14+3
x= 17
Vậy x = 17
7 . (x - 14 ) + 35 = 25 + 279 :9
7 . (x - 14 ) + 35 = 25 + 31
7 . (x - 14 ) + 35 = 56
7 . (x - 14 ) = 56 -35
7 . (x - 14 ) = 21
(x - 14 ) = 21 . 7
(x - 14 ) = 147
x = 147 + 14
x = 161
chúc bạn học tốt !
7 . ( x - 14 ) + 35 = 25 + 279 : 9
7x - 98 + 35 = 25 + 31
7x - 98 = 56 - 35
7x - 98 = 21
7x = 21 + 98
7x = 119
x = 119 : 7 = 17
Vậy x = 17
\(7.\left(x-14\right)+35=25+279:9\)
\(\Rightarrow7.\left(x-14\right)+35=25+31\)
\(\Rightarrow7.\left(x-14\right)+35=56\)
\(\Rightarrow7.\left(x-14\right)=56-35\)
\(\Rightarrow7.\left(x-14\right)=21\)
\(\Rightarrow x-14=21:7\)
\(\Rightarrow x-14=3\)
\(\Rightarrow x=3+14\)
\(\Rightarrow x=17\)
Good luck !!! Rất vui vì giúp đc bạn <3
7 . ( x - 14 ) + 35 = 25 + 279 : 9
7x - 98 + 35 = 25 + 31
7x - 98 = 21
7x = 119
x = 17
Chúc bn hc tốt <3