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

Toán Lớp 8: (x bình-1) (x+3) đây nha mn (x +5) (3x-2) (x+5)

Toán Lớp 8: (x bình-1) (x+3) đây nha mn
(x +5) (3x-2) (x+5)

Comments ( 2 )

  1. Lời giải và giải thích chi tiết:
    $(x²-1)(x+3)$
    $=x³+3x²-x-3$ 
    $(x+5)(3x-2)(x+5)$
    $=(x+5)²(3x-2)$
    $=(x²+10x+25)(3x-2)$
    $=3x³-2x²+30x²-20x+75x-50$
    $=3x³+28x²+50x-50$

  2. a) (x^2-1)(x+3)
    =x^2(x+3) – 1(x+3)
    =x^3 + 3x^2 – x – 3
    b) (x+5)(3x-2)(x+5)
    =(x+5)^2 (3x-2)
    =(x^2 + 10x + 25)(3x-2)
    =3x(x^2 + 10x + 25) – 2(x^2 + 10x + 25)
    = 3x^3 + 30x^2 + 75x – 2x^2 – 20x – 50
    = 3x^3 + (30x^2 -2x^2) + (75x-20x) -50
    = 3x^3 + 28x^2 + 55x – 50
     

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

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