Đáp án+Giải thích các bước giải:
$Từ,\dfrac{1+2y}{18}=\dfrac{1+4y}{24}\\=>24(1+2y)=18(1+4y)\\=>24+48y=18+72y\\=>72y-48y=24-18\\=>24y=6\\=>y=6:24\\=>y=\dfrac14$
$Từ,\dfrac{1+4y}{24}=\dfrac{1+6y}{6x}\\=>\dfrac{1+4 .\dfrac14}{24}=\dfrac{1+6.\dfrac14}{6x}\\=>\dfrac{1+1}{24}=\dfrac{1+\dfrac32}{6x}\\=>12x=24.\dfrac52\\=>12x=60\\=>x=60:12\\=>x=5$