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

Toán Lớp 8: a) 8×3 – 10x = 0 b) x2 + 16 = 10x. c) x3 + 27 = (x + 3)(9 – x)

Home/ Toán Lớp 8: a) 8×3 – 10x = 0 b) x2 + 16 = 10x. c) x3 + 27 = (x + 3)(9 – x)

Toán Lớp 8: a) 8×3 – 10x = 0 b) x2 + 16 = 10x. c) x3 + 27 = (x + 3)(9 – x)

Tháng Ba 7, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: a) 8×3 – 10x = 0 b) x2 + 16 = 10x. c) x3 + 27 = (x + 3)(9 – x)

Comments ( 1 )

  1. thuminhthong
    thuminhthong
    7 Tháng Ba, 2022 at 1:15 sáng
    Reply
    a)8x^3-10x=0
    2x(4x^2-5)=0
    =>@2x=0=>x=0
            @4x-5=0=>4x=5=>x=5/4
    Vậy x in{0;5/4}
    b)x^2+16=10x
    x^2+16-10x=0
    (x^2-10x+25)-9=0
    (x-5)^2-3^2=0
    (x-5-3)(x-5+3)=0
    (x-8)(x-2)=0
    =>@x-8=0=>x=8
            @x-2=0=>x=2
    Vậy x in{8;2}
    c)x^3+27=(x+3)(9-x)
    (x+3)(x^2-3x+9)-(x+3)(9-x)=0
    (x+3)(x^2-3x+9-9+x)=0
    (x+3)(x^2-2x)=0
    x(x+3)(x-2)=0
    =>@x=0
            @x+3=0=>x=-3
            @x-2=0=>x=2
    Vậy x in{0;-3;2}

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

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