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

Toán Lớp 8: giúp gấp a. ( -x mũ 2 + 6x mũ 3 – 26x + 21) : (2x – 3) cần ngay

Toán Lớp 8: giúp gấp
a. ( -x mũ 2 + 6x mũ 3 – 26x + 21) : (2x – 3)
cần ngay

Comments ( 2 )

  1. Giải đáp:
     a, (-x^2 + 6x^3 – 26x + 21) : (2x – 3)
    = (6x^2 – 9x^2 + 8x^2 – 12x – 14x + 21) : (2x – 3)
    = [(6x^3 – 9x^2) + (8x^2 – 12x) – (14x – 21)] : (2x – 3)
    = [3x^2 (2x – 3) + 4x(2x – 3) – 7(2x – 3)] : (2x – 3)
    = (2x – 3)(3x^2 + 4x – 7) : (2x – 3)
    = 3x^2 + 4x – 7

    toan-lop-8-giup-gap-a-mu-2-6-mu-3-26-21-2-3-can-ngay

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