9,15 . x + 2,85 . x = 48
=) ( 9,15 + 2, 85 ) . x = 48
=) 12.x = 48
=) x = 48 : 12
=) x = 4
9,15 . x + 2,85 . x = 48
(9,15 + 2,85) . x = 48
12 . x = 48
x = 48 : 12
x = 4
9,15 nhân x + 2,85 nhân x = 48
=> x nhân (9,15 + 2,85) = 48
=> x nhân 12 = 48
=> x = 48 : 12
=> x = 4
9,15 . x + 2,85 . x = 48
(9,15 + 2,85) . x = 48
12 . x = 48
x = 48 : 12
x = 4
9,15 . x + 2,85 . x = 48
(9,15 + 2,85) . x = 48
12 . x = 48
x = 48 : 12
x = 4
9,15 * x + 2,85 * x = 48
( 9,15 + 2,85 ) * x = 48
12 * x = 48
x = 48 : 12
x = 4
Vậy x = 4
( 9,15 + 2,85 ) . x = 48
12 . x = 48
x = 48 : 12
x = 4