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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: 7/11< x -1/7 < 10/13 Giúp mk vs ạ

Toán Lớp 6: 7/11< x -1/7 < 10/13 Giúp mk vs ạ

Comments ( 2 )

  1. Ta có : 7/11 < x – 1/7 < 10/13
    ⇔ 7/11 + 1/7 < x < 10/13 + 1/7
    ⇔ 49/77 + 11/77 < x < 70/91 + 13/91
    ⇔ 50/77 < x < 83/91
    Vậy , 50/77 < x < 83/91 .

  2. Giải đáp:
     $\dfrac{60}{77}<x<\dfrac{83}{91}$
    Lời giải và giải thích chi tiết:
     $\dfrac{7}{11}<x-\dfrac17<\dfrac{10}{13}\\\to \dfrac{7}{11}+\dfrac17<x<\dfrac{10}{13}+\dfrac17\\\to \dfrac{60}{77}<x<\dfrac{83}{91}$
    Nếu có $x \in \mathbb Z \to x \in \varnothing$

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222-9+11+12:2*14+14 = ? ( )