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

Toán Lớp 8: câu 1 : (x2 – 5x + 3)(x2 + 2) + 5(x3 + 2x) – 6 CÂU 2 ; (x – 2)(x – 3) – (x + 1)(x – 6

Toán Lớp 8: câu 1 : (x2 – 5x + 3)(x2 + 2) + 5(x3 + 2x) – 6
CÂU 2 ; (x – 2)(x – 3) – (x + 1)(x – 6

Comments ( 2 )

  1. Đoàn kết 1
    câu 1:
        (x²-5x+3)(x²+2)+5(x³+2x)-6
     = $x^4$+2x²-5x³-10x+3x²+6+5x³+10x-6
    = $x^4$+5x²
    = x²(x²+5)
    câu 2:
       (x-2)(x-3)-(x+1)(x-6)
    = x²-5x+6 – x²+5x+6
    = 12

  2. Câu 1
    (x^2-5x+3)(x^2+2)+5(x^3+2x)-6
    =(x^4+2x^2-5x^3-10x+3x^2+6)+(5x^3+10x)-6
    =(x^4+5x^2-5x^3-10x+6)+(5x^3+10x)-6
    =x^4+5x^2-5x^3-10x+6+5x^3+10x-6
    =x^4+5x^2
    Câu 2
    (x-2)(x-3)-(x+1)(x-6)
    =(x^2-3x-2x+6)-(x^2-6x+x-6)
    =(x^2-5x+6)-(x^2-5x-6)
    =x^2-5x+6-x^2+5x+6
    =12

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

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