X x 15 + X x 35 = 150
X x (15 + 35) = 150
X x 50 = 150
X= 150 : 50
X= 3
x X 15 + x X 35 = 150
x X ( 15 + 35 ) = 150
x X 50 = 150
x = 150 : 50
x = 3
Vậy x = 3
X x 15 + X x 35 = 150
X x ( 15 + 35 ) = 150
X x 50 = 150
X = 150 : 50
X = 3
vậy X = 3
tk mik nha !
Ta có :
x . 15 + x.35=150
2x .(15+35) =150
2x.50=150
2x=30
=>x=15
vậy x =15