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

Toán Lớp 8: 1) (4x^2-12xy+9y^2)^2-9x^2 2) 9x^2-(y^2-4y+4) 3) x^2-8x-9 ( giup mik voi )

Home/ Toán Lớp 8: 1) (4x^2-12xy+9y^2)^2-9x^2 2) 9x^2-(y^2-4y+4) 3) x^2-8x-9 ( giup mik voi )

Toán Lớp 8: 1) (4x^2-12xy+9y^2)^2-9x^2 2) 9x^2-(y^2-4y+4) 3) x^2-8x-9 ( giup mik voi )

Tháng Bảy 23, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: 1) (4x^2-12xy+9y^2)^2-9x^2
2) 9x^2-(y^2-4y+4)
3) x^2-8x-9 ( giup mik voi )

Comments ( 2 )

  1. maianhtuanh
    maianhtuanh
    23 Tháng Bảy, 2022 at 11:29 sáng
    Reply
    Giải đáp:
    1) (4x^2-12xy+9y^2)^2-9x^2
    = (4x^2 – 12xy + 9y^2 – 3x)( 4x^2 – 12xy + 9y^2 + 3x)
    = [(2x – 3y)^2 -3x][ (2x -3y)^2 + 3x]
    2) 9x^2 – (y^2 – 4y + 4)
    = (3x)^2 – (y-2)^2
    = (3x – y + 2)( 3x + y-2)
    3) x^2-8x-9
    = x^2 -9x + x – 9
    = x(x -9) + (x – 9)
    =(x +1)(x -9)

  2. tuanh
    tuanh
    23 Tháng Bảy, 2022 at 11:28 sáng
    Reply
    1) (4x^2-12xy+9y^2)^2 – 9x^2
    = (4x^2-12xy+9y^2-3x) (4x^2-12xy+9y^2+3x)
    = [(2x-3y)^2-3x] [(2x-3y)^2+3x]
    2) 9x^2 – (y^2-4y+4)
    = (3x)^2- (y-2)^2
    = (3x-y+2) (3x+y-2)
    3) x^2 – 8x – 9
    = x^2 + x – 9x – 9
    = x (x+1) – 9 (x+1)
    = (x-9) (x+1)

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

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