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

Toán Lớp 6: 3x+9 ⋮ 2x+1 Cứu với iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

Tháng Mười Một 19, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: 3x+9 ⋮ 2x+1
Cứu với iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii

Comments ( 2 )

  1. khanhngantoan
    khanhngantoan
    19 Tháng Mười Một, 2022 at 7:30 sáng
    Reply
    Giải đáp:²³√
    3x+9 ⋮ 2x+1
    => 2(3x + 9) ⋮ 2x + 1
    => 6x + 18 ⋮ 2x + 1
    => 6x + 3 + 15 ⋮ 2x + 1
    => 3(2x + 1) + 15 ⋮ 2x + 1
    => 15 ⋮ 2x + 1 => 2x + 1 ∈ Ư(15)
    => 2x + 1 ∈ {-15; -5; -3; -1; 1; 3; 5; 15}
    => 2x ∈ {-16; -6; -4; -2; 0; 2; 4; 14}
    => x ∈ {-8; -3; -2; -1; 0; 1; 2; 7}
     

  2. mocmien87
    mocmien87
    19 Tháng Mười Một, 2022 at 7:30 sáng
    Reply
    Giải đáp:
    ⇒ x ∈ {1; 0; 4; -3}
    Lời giải và giải thích chi tiết:
    $\text{3x + 2 $\vdots$ 2x – 1}$ $\\$ $\text{⇒ 2(3x + 2) $\vdots$ 2x – 1}$ $\\$ $\text{⇒ 6x + 4 $\vdots$ 2x – 1}$ $\\$ $\text{⇒ 2. 3x – 3 + 7 $\vdots$ 2x – 1}$ $\\$ $\text{⇒ 3. (2x – 1) + 7 $\vdots$ 2x – 1}$ $\\$ $\text{Vì 3. (2x – 1) $\vdots$ 2x – 1 }$ $\\$ $\text{⇒ 7 $\vdots$ 2x – 1}$ $\\$ $\text{⇒ 2x – 1 ∈ Ư(7)}$ $\\$ $\text{Ta có: Ư(7) = {1; -1; 7; -7}}$ $\\$ $\text{⇒ 2x – 1 ∈ {1; -1; 7; -7}}$ $\\$ $\text{⇒ x ∈ {1; 0; 4; -3}}$

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

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