a)18 + 2 x y = 50
2 x y = 50 - 18
2 x y = 32
y = 32 : 2
y = 16
b)219 - (y - 19) = 100
(y - 19) = 219 - 100
(y - 19) = 119
y = 119 - 19
y = 100
c)2 x (y - 12) + 18 = 164
2 x (y - 12) = 164 - 18
2 x (y - 12) = 146
( y - 12 ) = 146 : 2
( y - 12 ) = 73
y = 73 - 12
y = 61
a, 18+2xy=50
2xy=50-18
2xy=32
y=16
b, 219-(y-19)=100
y-19=219-100
y-19=119
y=119+19
y=138
c, 2x(y-12) +18 =164
2x(y-12) =164-18
2x(y-12) =146
y-12 =146: 2
y-12 =73
y =73+12
y = 85
a) \(18+2\times y=50\)
\(2\times y=50-18\)
\(2\times y=32\)
\(y=32\div2\)
\(y=16\)
Vậy y = 16
b) \(219-\left(y-19\right)=100\)
\(y-19=219-100\)
\(y-19=119\)
\(y=119+19\)
\(y=138\)
Vậy y = 138
c) \(2\times\left(y-12\right)+18=164\)
\(2\times\left(y-12\right)=164-18\)
\(2\times\left(y-12\right)=146\)
\(y-12=146\div2\)
\(y-12=73\)
\(y=85\)
Vậy y = 85
