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

Toán Lớp 8: (8-5x)(x+2)+4(x-2)(x+1)+2(x-2)(x+2)+10

Toán Lớp 8: (8-5x)(x+2)+4(x-2)(x+1)+2(x-2)(x+2)+10

Comments ( 2 )

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

  2. Giải đáp:
    =x^2-6x+10
    Lời giải và giải thích chi tiết:
    (8-5x)(x+2)+4(x-2)(x+1)+2(x-2)(x+2)+10
    =8x-10x-5x^2+16+4(x^2-x-2)+2(x^2-4)+10
    =-5x^2-2x+16+4x^2-4x-8+2x^2-8+10
    =x^2-6x+10

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