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

Toán Lớp 6: $(2x × 3/5 ) ^{2}$ – 9/25 = 0 Help me voiws cacs vip pro

Toán Lớp 6: $(2x × 3/5 ) ^{2}$ – 9/25 = 0
Help me voiws cacs vip pro

Comments ( 2 )

  1. ( 2x xx 3/5) ^2 – 9/25 = 0
    (2x xx 3/5)^2 = 0 + 9/25
    (2x xx 3/5)^2 = 9/25
    => (2x xx 3/5 ) ^2 = (±3/5)^2
    => 2x xx 3/5 = 3/5
    => 2x = 3/5 : 3/5
    2x = 3/5 xx 5/3
    2x = 1
    x = 1 : 2
    x = 1/2
    => 2x xx 3/5 = (-3)/(5)
    2x = (-3)/5 : 3/5
    2x= -1
    x=-1:2
    x=-1/2
    Vậy x ∈ { 1/2; -1/2}
     

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

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