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

Toán Lớp 8: 1) x^2 – 2x – 3x + 6 2) x^2 – 8x + 12 3) 3x^2 – 16x + 5 4) 6x^2 + 17x +12

Toán Lớp 8: 1) x^2 – 2x – 3x + 6
2) x^2 – 8x + 12
3) 3x^2 – 16x + 5
4) 6x^2 + 17x +12

Comments ( 2 )

  1. Giải đáp + giải thích các bước làm :
    Chúc bạn học tốt nhé!!

     
     

    toan-lop-8-1-2-2-3-6-2-2-8-12-3-3-2-16-5-4-6-2-17-12

  2. 1) x^2-2x-3x+6
    =(x^2-2x)-(3x-6)
    =x(x-2)-3(x-2)
    =(x-2)(x-3)
    2) x^2-8x+12
    =x^2-2x-6x+12
    =(x^2-2x)-(6x-12)
    =x(x-2)-6(x-2)
    =(x-2)(x-6)
    3) 3x^2-16x+5
    =3x^2-x-15x+5
    =(3x^2-x)-(15x-5)
    =x(3x-1)-5(3x-1)
    =(3x-1)(x-5)
    4) 6x^2+17x+12
    =6x^2+9x+8x+12
    =(6x^2+9x)+(8x+12)
    =3x(2x+3)+4(2x+3)
    =(2x+3)(3x+4)

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

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