Đáp án:
$\dfrac{16}{27}$
Giải thích các bước giải:
$1\dfrac13:1\dfrac14:1\dfrac15:1\dfrac16:1\dfrac17:1\dfrac18\\=\dfrac43:\dfrac54:\dfrac65:\dfrac76:\dfrac87:\dfrac98\\=\dfrac43\times\dfrac45\times\dfrac56\times\dfrac67\times\dfrac78\times\dfrac89\\=\dfrac43\times\dfrac{4\times5\times6\times7\times8}{5\times6\times7\times8\times9}\\=\dfrac43\times\dfrac49\\=\dfrac{16}{27}$