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

Toán Lớp 8: (x-1)³ + 3(x+1)² = (x² – 2x +4) (x+2) TÌM X HELPPPPPPPPPPPPPPPPPPPPP Ạ

Toán Lớp 8: (x-1)³ + 3(x+1)² = (x² – 2x +4) (x+2)
TÌM X
HELPPPPPPPPPPPPPPPPPPPPP Ạ

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
     (x-1)^3 + 3(x+1)^2 = (x^2-2x+4)(x+2)
    <=> x^3 – 3x^2 + 3x – 1+3(x^2+2x+1)=x^3+8
    <=> -3x^2+3x+3x^2+6x=8+1-3
    <=> 9x=6
    <=> x=2/3

  2. $(=) -3x^2+3x-1+3x^2+6x+3=8$
    $(=) 9x+2=8$
    $(=) 9x=8-2$
    $(=) 9x=6$
    $=) x=2/3$

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

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