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

Toán Lớp 8: PTĐTTNT : x ³-9x ²+6x+16 x ³-6x-x+30 ²

Toán Lớp 8: PTĐTTNT :
x ³-9x ²+6x+16
x ³-6x-x+30 ²

Comments ( 2 )

  1. x^3 – 9x^2 + 6x + 16
    = x^3 – 2x^2 – 7x^2 + 14x – 8x + 16
    = x^2(x – 2) – 7x(x – 2) – 8(x – 2)
    = (x^2 – 7x – 8)(x – 2)
    = (x^2 + x – 8x – 8)(x – 2)
    = (x – 8)(x + 1)(x – 2)
    x^3 – 6x^2 – x + 30
    = x^3 + 2x^2 – 8x^2 – 16x + 15x + 30
    = x^2(x + 2) – 8x(x + 2) + 15(x + 2)
    = (x^2 – 8x + 15)(x + 2)
    = (x^2 – 3x – 5x + 15)(x + 2)
    = (x – 3)(x – 5)(x + 2)

  2. Giải đáp:
    Bạn xem hình 
    Lời giải và giải thích chi tiết:
     

    toan-lop-8-ptdttnt-9-6-16-6-30

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

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