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

Toán Lớp 8: tìm X 3x.(12x+4)−9x(4x−3)=30 Dễ thôi cho mọi ng có điểm

Toán Lớp 8: tìm X
3x.(12x+4)−9x(4x−3)=30
Dễ thôi cho mọi ng có điểm

Comments ( 2 )

  1. $\text{3x.(12x+4)-9x.(4x-3)=30}$
    $\text{36}$$x^{2}+12x-36$ $x^{2}+27x=30$
    $\text{(36}$$x^{2}-36$ $x^{2})+(12x+27x)=30$
    $\text{39x=30}$
    $\text{x=}$$\dfrac{10}{13}$
    $\text{#mct}$

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