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

Toán Lớp 8: 5 ???? ( ???? + 1 ) − 3 ( ???? + 1 ) ( ???? − 1 ) = 2 ????

Toán Lớp 8: 5 ???? ( ???? + 1 ) − 3 ( ???? + 1 ) ( ???? − 1 ) = 2 ????

Comments ( 1 )

  1. Giải đáp:
    Phương trình vô nghiệm.
    Lời giải và giải thích chi tiết:
    $5x( x+ 1 ) − 3 (x + 1 ) (x − 1 ) = 2 x\\ \Leftrightarrow 5x( x+ 1 ) − 3 (x + 1 ) (x − 1 ) – 2 x=0\\ \Leftrightarrow 5x^2+ 5x − 3 (x ^2 − 1 ) – 2 x=0\\ \Leftrightarrow 5x^2+ 5x − 3 x ^2 +3 – 2 x=0\ \Leftrightarrow 2x^2+ 3x+3 =0\\\ \Leftrightarrow x^2+ \dfrac{3}{2}x+\dfrac{3}{2}=0\\ \Leftrightarrow x^2+ 2.\dfrac{3}{4}x+\dfrac{9}{16}+\dfrac{15}{16}=0\\ \Leftrightarrow \underbrace{\left(x+\dfrac{3}{4}\right)^2+\dfrac{15}{16}}_{>0 \ \forall \ x}=0$
    $\Rightarrow $Phương trình vô nghiệm.

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