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

Toán Lớp 8: a) 8x^2y-8xy+2x b) x^2-6x-y^2+9 c) (x^2+2x)(x^2+4x+3)-24 (giup em voi )

Tháng Bảy 26, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: a) 8x^2y-8xy+2x
b) x^2-6x-y^2+9
c) (x^2+2x)(x^2+4x+3)-24 (giup em voi )

Comments ( 2 )

  1. bichquyenlien
    bichquyenlien
    26 Tháng Bảy, 2022 at 1:23 chiều
    Reply
    a, 8x2y – 8xy + 2x = 2x(4xy – 4y + 1)
    b, x2 – 6x – y2 + 9 = (x2 – 6x + 9) – y2
                                                                = (x – 9)2 – y2
                                            = (x – 9 – y)(x – 9 + y)
    c, (x^2+2x)(x^2+4x+3)-24 = x4 + 2x3 + 4x3 + 8x2 + 3x2 + 6x – 24
                                               = x4 + (2x3 + 4x3) + (4x2 + 3x2) + 6x – 24
                                               = x4 + 6x3 + 7x2 + 6x – 24
                                            

  2. hoquyly
    hoquyly
    26 Tháng Bảy, 2022 at 1:23 chiều
    Reply
    #huy
    a) 8x^2y-8xy+2x
    =2x(4xy-4y+1)
    =2x[4y(x-1)+1]
    b) x^2-6x-y^2+9
    =(x^2-6x+9)-y^2
    =(x-3)^2-y^2
    =(x-3+y)(x-3-y)
    c) (x^2+2x)(x^2+4x+3)-24
    =x^4+4x^3+3x^2+2x^3+8x^2+6x-24
    =x^4+6x^3+11x^2+6x-24
     

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

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