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

Toán Lớp 8: (3x + 2)(4×2 – 6x + 3) + (x + 2)^2

Toán Lớp 8: (3x + 2)(4×2 – 6x + 3) + (x + 2)^2

Comments ( 2 )

  1. (3x + 2)(4x^2 – 6x + 3) + (x + 2)^2
    =12x^3-18x^2+9x+8x^2-12x+6+x^2+4x+4
    =12x^3-(x^2+8x^2-18x^2)+(9x-12x+4x)+(4+6)
    =12x^3-9x^2+x+10

  2. (3x+2)(4x^2–6x+3)+(x+2)^2
    =12x^3−18x^2+9x+8x^2−12x+6+x^2+4x+4
    =12x^3+(x^2+8x^2−18x^2)+(9x−12x+4x)+(4+6)
    =12x^3−9x^2+x+10

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

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