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

Toán Lớp 8: bài 1 tính g, (x-1)(x-2)(x-3)(x-4) h, (x^2+2x+1)(-3x-(x^2-1)(-2)

Toán Lớp 8: bài 1 tính
g, (x-1)(x-2)(x-3)(x-4)
h, (x^2+2x+1)(-3x-(x^2-1)(-2)

Comments ( 1 )

  1. g)(x-1)(x-2)(x-3)(x-4)
    =(x^2-2x-x+2)(x^2-4x-3x+12)
    =(x^2-3x+2)(x^2-7x+12)
    =(x^4-7x^3+12x^2-3x^3+21x^2-36x+2x^2-14x+24)
    =x^4+(-7x^3-3x^3)+(12x^2+21x^2+2x^2)+(-36x-14x)+24
    =x^4-10x^3+35x^2-50x+24
    h)(x^2+2x+1)[-3x-(x^2-1).(-2)]
    =(x^2+2x+1)[-3x-(-2x^2+2)]
    =(x^2+2x+1)(-3x+2x^2-2)
    =-3x^3+2x^4-2x^2-6x^2+4x^3-4x-3x+2x^2-2
    =2x^4+(4x^3-3x^3)+(-6x^2+2x^2-2x^2)+(-4x-3x)-2
    =2x^4+x^3-6x^2-7x-2

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