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

Toán Lớp 8: x( x – 5 )(x+ 5) –( x – 2) (x ²+2x+4)=3

Toán Lớp 8: x( x – 5 )(x+ 5) –( x – 2) (x ²+2x+4)=3

Comments ( 2 )

  1. x(x-5)(x+5)-(x-2)(x^2+2x+4)=3
    ⇔x(x^2-25)-(x^3-8)=3
    ⇔x^3-25x-x^3+8=3
    ⇔-25x=3-8
    ⇔-25x=-5
    ⇔x=1/5
    Vậy x=1/5
     

  2. Chúc bạn học tốt 
    Cho mình xin hay nhất nha.

    toan-lop-8-5-5-2-2-4-3

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

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