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

Toán Lớp 8: 10/ x^3 + 3x^2 – 16x – 48 11/ x^3 – x^2 – 3x + 27 12/ x^3 + 2x^2 – 2x – 1 13/ 4x(x – 3y) + 12y(3y – x) 14/ a^2 – 2a – 4b^2 – 4b

Home/ Toán Lớp 8: 10/ x^3 + 3x^2 – 16x – 48 11/ x^3 – x^2 – 3x + 27 12/ x^3 + 2x^2 – 2x – 1 13/ 4x(x – 3y) + 12y(3y – x) 14/ a^2 – 2a – 4b^2 – 4b

Toán Lớp 8: 10/ x^3 + 3x^2 – 16x – 48 11/ x^3 – x^2 – 3x + 27 12/ x^3 + 2x^2 – 2x – 1 13/ 4x(x – 3y) + 12y(3y – x) 14/ a^2 – 2a – 4b^2 – 4b

Tháng Sáu 2, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: 10/ x^3 + 3x^2 – 16x – 48
11/ x^3 – x^2 – 3x + 27
12/ x^3 + 2x^2 – 2x – 1
13/ 4x(x – 3y) + 12y(3y – x)
14/ a^2 – 2a – 4b^2 – 4b

Comments ( 2 )

  1. buianhtuan
    buianhtuan
    2 Tháng Sáu, 2022 at 8:47 chiều
    Reply
    10/x³ + 3x² – 16x – 48
    =x²(x+3)-16(x+3)
    =(x²-16)(x+3)
    11/x³ – x² – 3x + 27
    =(x+3)(x²-4x+9)
    12/x³ + 2x² – 2x – 1
    =(x³-1)+2x.(x-1)
    =(x-1).(x²+xy+y²)+2x.(x-1)
    =(x-1).(x²+xy+2x+y²)
    13/ 4x(x – 3y) + 12y(3y – x)
    =4x(x-3y)-12y(x-3y)
    =(4x-12y).(x-3y)
    =4.(x-3y).(x-3y)
    =4.(x-3y)²
    14/a² – 2a – 4b²– 4b
    =a²-4b²-2a-4b
    =(a-2b)(a+2b)-2(a+2b)
    =(a+2b)(a-2b-2)

  2. dinhcongson
    dinhcongson
    2 Tháng Sáu, 2022 at 8:47 chiều
    Reply
    x^3 + 3x^2 – 16x – 48
     x^3+7x^2+12x-4x^2-28-48
    =( x − 4 ) ( x ^2 + 7 x + 1 2 )
    =(x-4)(x^2+3x+4x+12)
    =(x−4)(x+3)(x+4)
    11/x^3 – x^2 – 3x + 27
    =x^3-4x^2+9x+3x^2-12x+17
    =(x+3)(x^2-4x+9)
    12/x^3 + 2x^2 – 2x – 1
    =x^3-3x^2+x-1x^2-3x-1
    =(x-1)(x^2+3x+1)
    13/4x(x – 3y) + 12y(3y – x)
    =4x^2-12xy+12y(3y-x)
    =4x^2-12xy-12xy+36y^2
    =4x^2-24xy+36y^2
    14/a^2 – 2a – 4b^2 – 4b
    =a^2-4b^2-2a-4b
    =(a-2b)(a+2b)-2(a-2b)
    =(a+2b)(a-2b-2)

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

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