Tim x 70 `vdots` x 84 `vdots` x 140 `vdots` x

2 bình luận về “Tim x 70 `vdots` x 84 `vdots` x 140 `vdots` x”

1. 70 vdots x

   84 vdots x

   140 vdots x

   =>x= ƯCLN(70;84;140)

   Ta có: 70=7.5.2

             84=2^2 .3.7

             140=7.5.2^2

     => x= ƯCLN(70;84;140)=2.7=14

   Vậy x=14

    

   Trả lời
2. 70 $\vdots$ x

   84 $\vdots$ x

   140 $\vdots$ x

   $\Longrightarrow$ x ∈ ƯCLN { 70, 84, 140 }

   Ta có:

   70 = 2 . 5 . 7

   84= 2² . 3 . 7

   140 = 2² . 5 . 7

   $\Longrightarrow$ x = 2 . 7

   Vậy: x = 14

    

   Trả lời