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

Toán Lớp 8: d. x^2 + 2x + 1 – 16 e. x^2 + x – 6 f. x^2 -5x -6 g, x^2 + 6x +8

Toán Lớp 8: d. x^2 + 2x + 1 – 16
e. x^2 + x – 6
f. x^2 -5x -6
g, x^2 + 6x +8

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     d) x^2+2x+1-16
    =(x^2+2.x.1+1^2)-16
    =(x+1)^2-4^2
    =(x+1-4)(x+1+4)
    =(x-3)(x+5)
     e) x^2+x-6
    =x^2-2x+3x-6
    =x(x-2)+3(x-2)
    =(x-2)(x+3)
     f) x^2-5x-6
    =x^2+6x-x-6
    =x(x+6)-(x+6)
    =(x+6)(x-1)
     g) x^2+6x+8
    =x^2+2x+4x+8
    =x(x+2)+4(x+2)
    =(x+2)(x+4)

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