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

Toán Lớp 8: Giúp vs ạ x ² +5x-6=0 x ²+8x-9=0 x ²-6-x-2=0

Home/ Toán Lớp 8: Giúp vs ạ x ² +5x-6=0 x ²+8x-9=0 x ²-6-x-2=0

Toán Lớp 8: Giúp vs ạ x ² +5x-6=0 x ²+8x-9=0 x ²-6-x-2=0

Tháng Hai 4, 2023 Toán học 1 Comment 0 views

Toán Lớp 8: Giúp vs ạ
x ² +5x-6=0
x ²+8x-9=0
x ²-6-x-2=0

Comments ( 1 )

  1. dongoctuan
    dongoctuan
    4 Tháng Hai, 2023 at 12:44 sáng
    Reply
    a)x²+5x-6=0
    ⇔x²+6x-x-6=0
    ⇔x(x+6)-(x+6)=0
    ⇔(x+6)(x-1)=0
    (1)x+6=0⇔x=-6
    (2)x-1=0⇔x=1
    Vậy S={-6;1}
    b)x²+8x-9=0
    ⇔x²+9x-x-9=0
    ⇔x(x+9)-(x+9)=0
    ⇔(x+9)(x-1)=0
    (1)x+9=0⇔x=-9
    (2)x-1=0⇔x=1
    Vậy S={-9;1}
    c)x²-6-x=0
    ⇔x²-x-6=0
    ⇔x²+2x-3x-6=0
    ⇔x(x+2)-3(x+2)=0
    ⇔(x+2)(x-3)=0
    (1)x+2=0⇔x=-2
    (2)x-3=0⇔x=3
    Vậy S={-2;3}
     

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

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