Question

X+X x2= 345

Answer 1

Ta có : 

X+Xx2=X*3

Vậy X*3=345

X= 345:3

X = 115

Answer 2

x +  x x 2 = 345

x x ( 2 + 1 ) = 345

x x 3 = 345

x = 345 : 3

x = 115

Answer 3

X + X * 2 = 345

X * 1 + X * 2 = 345

X * ( 1+ 2 ) = 345

X * 3          = 345

X               = 345 : 3

X               = 115

Answer 4

x +  X x 2 = 345

X x ( 2 + 1 ) = 345

X x 3 = 345

X= 345 : 3

X = 115

Answer 5

X + X * 2 = 345

X * 1 ( 1 + 2 ) = 345

X * 3         = 345

X              = 345 : 3

X              = 115

Đ / S : 115

Answer 6

x +  X x 2 = 345

X x ( 2 + 1 ) = 345

X x 3 = 345

X= 345 : 3

X = 115

Answer 7

x+x.2=345

=> x.(1+2) =345

=> x.3       =345

=> x          =345:3

=> x          =115