x.3,1+x.6,9+5,4=30,4
=> x.(3,1+6,9)+5,4=30,4
=> x.10 =30,4-5,4
=> x.10 =25
=> x =25:10
=> x =2,5
Vậy x=2,5
X x 3,1 + X x 6,9 + 5,4 = 30,4
X x(3,1+6,9) + 5,4 =30,4
X x 10 +5,4 = 30,4
X x 10= 30,4 - 5,4
X x 10=25
X=25:10
X= 2,5
bằng 25,0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
bằng 2,5 bạn nhé