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

Toán Lớp 8: x(1 – 3x)(4 – 3x) – (x – 4)(3x + 5) giúp mik vs cần gấp lắm

Tháng Hai 3, 2023 Toán học 2 Comments 0 views

Toán Lớp 8: x(1 – 3x)(4 – 3x) – (x – 4)(3x + 5)
giúp mik vs cần gấp lắm

Comments ( 2 )

  1. dongoctuan
    dongoctuan
    3 Tháng Hai, 2023 at 9:29 sáng
    Reply
    x(1 – 3x)(4 – 3x) – (x – 4)(3x + 5) 
    = $9x^{3}$ – $18x^{2}$ + 11x+20
    x≈-0.7

  2. kimlien
    kimlien
    3 Tháng Hai, 2023 at 9:29 sáng
    Reply
    ~rai~
    \(x(1-3x)(4-3x)-(x-4)(3x+5)\\=(x-3x^2)(4-3x)-(3x^2+5x-12x-20)\\=4x-3x^2-12x^2+9x^3-3x^2-5x+12x+20\\=9x^3-(3x^2+12x^2+3x^2)+(4x-5x+12x)+20\\=9x^3-18x^2+11x+20.\)

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

Thanh Hường

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