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

Toán Lớp 8: giúp với :(8-5x)(x+2)+4(x-2)(x+1)+(x-2)(x+2)

Toán Lớp 8: giúp với :(8-5x)(x+2)+4(x-2)(x+1)+(x-2)(x+2)

Comments ( 2 )

  1. (8-5x)(x+2)+4(x-2)(x+1)+(x-2)(x+2)
    =8x+16-5x^2-10x+4x^2+4x-8x-8+x^2-4
    =-6x+4
     

  2. ~ Bạn tham khảo ~
    (8-5x)(x+2)+4(x-2)(x+1)+(x-2)(x+2)
    = 8x+16-5x^2-10x+4(x^2+x-2x-2) + x^2-4
    = 8x+16-5x^2-10x+4x^2+4x-8x-8 + x^2-4
    = -6x+4

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

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