TÌM x
TÌM x:
a) 7X - 8 = 7 x 3
b) 2X - 12 - X = 0
c) 135 - 5 ( X + 4 ) = 35
d) 4 x ( X + 41 ) = 2 x 200
e) 25 + 3 ( X - 8 ) = 106
g) ( X + 1 ) + ( X + 4 ) + ( X + 7 ) +...+ ( X + 28 ) = 155
a) 7X - 8 = 7 x 3
b) 2X - 12 - X = 0
c) 135 - 5 ( X + 4 ) = 35
d) 4 x ( X + 41 ) = 2 x 200
e) 25 + 3 ( X - 8 ) = 106
g) ( X + 1 ) + ( X + 4 ) + ( X + 7 ) +...+ ( X + 28 ) = 155