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

Toán Lớp 6: Câu 6: Tìm x, biết: (2đ) 1) x –4 = -10 2) x2= 25 3) 3x + 17 = 2

Toán Lớp 6: Câu 6: Tìm x, biết: (2đ)
1) x –4 = -10
2) x2= 25
3) 3x + 17 = 2

Comments ( 2 )

  1. 1) x – 4 = -10
    => x = (-10) + 4
    => x = -6
    2) x^{2} = 25
    => x^{2} = 5^{2}
    => x = 5 hoặc x = -5
    ĐỀ THẾ NÀY ĐÚNG KHÔNG Ạ
    3) 3x + 17 = 2
    => 3x = 2 – 17
    => 3x = -15
    => x =(-15) : 3
    => x =-5

  2. Answer
    1) x – 4 = -10
    => x = -10 + 4
    => x = -6
    $\text{Vậy}$ x = -6
    ___________________
    2) x^{2} = 25
    => x^{2} = (+-5)^{2}
    => x = +-5
    $\text{Vậy}$ x \in {5 ; -5}
    ____________________
    3) 3x + 17 = 2
    => 3x = 2 – 17
    => 3x = -15
    => x = -15 : 3
    => x = -5
    $\text{Vậy}$ x = -5

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

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