Toán Lớp 6: Hãy tìm x,biết: 8 .|2x

8 . |2x - 9| = 104 <=>|2x – 9| = 104 : 8 = 13 <=>|2x| = 13 - 9 = 4 <=>|x| = 4 : 2 = 2 <=>x in {2;-2} Vậy x in {2;-2}

8 .|2x - 9|=104 |2x-9| = 104 : 8 |2x+9| = 13 |2x| = 13 -9 |2x| = 4 : 2 => x ∈ { 2,-2} Vậy x ∈ { 2,-2}

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Toán Lớp 6: Hãy tìm x,biết: 8 .|2x – 9|=104