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

Toán Lớp 8: 13x ² – 3x( x-4 ) – 10x ²= 15 Tìm x = pp dùng HĐT nha

Toán Lớp 8: 13x ² – 3x( x-4 ) – 10x ²= 15
Tìm x = pp dùng HĐT nha

Comments ( 2 )

  1. 13x ² – 3x( x-4 ) – 10x ²= 15
    ⇔13x^2-3x^2+12x-10x^2-15=0
    ⇔12x-15=0
    ⇔3(4x-5)=0
    ⇔4x-5=0
    ⇔x=5/4

  2. 13x^2-3x(x-4)-10x^2=15
    ⇔13x^2-3x^2+12x-10x^2=15
    ⇔12x=15
    ⇔x=(15)/(12)
    Vậy x=(15)/(12)
     

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