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

Toán Lớp 7: a) 5x – 1: x+2 b) x+ 17 : x+ 3

Toán Lớp 7: a) 5x – 1: x+2
b) x+ 17 : x+ 3

Comments ( 2 )

  1. Giải đáp:
    a.$x\in\{-1, -3, -13, 9\}$
    b.$x\in\{-2, -1, 4, 9, -4, -5, -10, -17\}$
    Lời giải và giải thích chi tiết:
    a.Ta có:
    $5x-1\quad\vdots\quad x+2$
    $\to 5x+10-11\quad\vdots\quad  x+2$
    $\to 5(x+2)-11 \quad\vdots\quad  x+2$
    $\to 11 \quad\vdots\quad  x+2$
    $\to x+2\in U(11)$
    $\to x+2\in\{1,-1,-11,11\}$
    $\to x\in\{-1, -3, -13, 9\}$
    b.Ta có:
    $x+17\quad\vdots\quad  x+3$
    $\to x+3+14 \quad\vdots\quad  x+3$
    $\to 14\quad\vdots\quad  x+3$
    $\to x+3\in U(14)$
    $\to x+3\in\{1,2,7,14, -1, -2, -7, -14\}$
    $\to x\in\{-2, -1, 4, 9, -4, -5, -10, -17\}$

  2. Lời giải và giải thích chi tiết:
    a)
    5x – 1 \vdots x + 2
    -> 5(x + 2) – 10 – 1 \vdots x + 2
    -> 5(x + 2) – 11 \vdots x + 2
    -> 11 \vdots x + 2
    -> x + 2 \in Ư_((11)) = {-11 ; -1 ; 1 ; 11}
    -> x \in {-13 ; -3 ; -1 ; 9}
    b)
    x + 17 \vdots x + 3
    -> (x + 3) + 14 \vdots x + 3
    -> 14 \vdots x + 3
    -> x + 3 \in Ư_((14)) = {-14 ; -7 ; -2 ; -1 ; 1 ; 2 ; 7 ; 14}
    -> x \in {-17 ; -10 ; -5 ; -4 ; -2 ; -1 ; 4 ; 11}
    text(#Kakaseto)

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