Question

Tìm x,y biết rằng :

1+2y/18=1+4y/24=1+6y/6x

Answer 1

Ý bạn là :\(1+\frac{2y}{18}=1+\frac{4y}{24}=1+\frac{6y}{6x}\)

hay \(\frac{1+2y}{18}=\frac{1+4y}{24}=\frac{1+6y}{6x}\)ạ ??

Lần sau ghi rõ :>

Answer 2

Ta có: \(\frac{1+2y}{18}=\frac{1+4y}{24}\)

=> \(\left(1+2y\right).24=\left(1+4y\right).18\)

=> \(24+48y=18+72y\)

=> \(24-18=72y-48y\)

=> \(24y=6\)

=> \(y=\frac{1}{4}\)

Với y = 1/4 => \(\frac{1+4\cdot\frac{1}{4}}{24}=\frac{1+6\cdot\frac{1}{4}}{6x}\)

=> \(\frac{1}{12}=\frac{\frac{5}{2}}{6x}\)

=> \(6x=\frac{5}{2}.12\)

=> \(6x=30\)

=> \(x=5\)

Answer 3

ta co : 1+2y/18=1+4y/24

=> 24(1+2y)=18(1+4y)

=>24+48y=18+72y

=>24-18=72y-48y

=>6=24y

=>y=1/4 

thay y thanh 1/4 vao de bai ta co : 

1+1/2/18=1+1/24=(1+3/2)/6x

=>1/12=(5/2)/6x

=>12/(5/2)=6x

=>30=6x/x=5

vay x=5 va y=1/4