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

Toán Lớp 8: h,(X-4)^2-(x-2)(x+2)=6 i,x(2x-3)-2(3-2x) k,4(x-3)^2-(2x-1)(2x+1)=10 Mn giúp e gái m vs nha

Toán Lớp 8: h,(X-4)^2-(x-2)(x+2)=6
i,x(2x-3)-2(3-2x)
k,4(x-3)^2-(2x-1)(2x+1)=10
Mn giúp e gái m vs nha

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
     h, (x-4)^2 – (x-2)(x+2)=6
    <=> x^2 -8x+16 -x^2 +4=6
    <=> -8x = -14
    <=> x= 7/4
    Vậy x=7/4 
    k, 4(x-3)^2 – (2x-1)(2x+1)=10
    <=> 4(x^2-6x+9) – (4x^2 -1)=10
    <=> 4x^2 -24x +36-4x^2 +1=10
    <=> -24x = -27
    <=> x=27/24
    Vậy x=27/24

  2. $\\$
    h,
    (x-4)^2 – (x-2)(x+2)=6
    -> x^2 – 8x + 16 – (x^2-4)=6
    ->x^2-8x + 16 – x^2+4=6
    -> -8x + 20=6
    -> -8x=-14
    ->x=7/4
    Vậy x=7/4
    i đề thiếu
    k
    4(x-3)^2 – (2x-1)(2x+1)=10
    ->4(x^2-6x+9) – (4x^2-1)=10
    ->4x^2 – 24x + 36 – 4x^2+1=10
    -> -24x +  37=10
    -> -24x=-27
    ->x=27/24
    Vậy x=27/24

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