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

Toán Lớp 8: Làm tính chia a) (25x^5 – 10x^4 + 20x²): 5x² b) (-4x^5 +3x² – 4x^3): 2x^2 c) (5x²y² +12x^2y^3 – 10:xy): 5.xy d) (2x^4 –13x^3 +15x² +11x

Home/ Toán Lớp 8: Làm tính chia a) (25x^5 – 10x^4 + 20x²): 5x² b) (-4x^5 +3x² – 4x^3): 2x^2 c) (5x²y² +12x^2y^3 – 10:xy): 5.xy d) (2x^4 –13x^3 +15x² +11x

Toán Lớp 8: Làm tính chia a) (25x^5 – 10x^4 + 20x²): 5x² b) (-4x^5 +3x² – 4x^3): 2x^2 c) (5x²y² +12x^2y^3 – 10:xy): 5.xy d) (2x^4 –13x^3 +15x² +11x

Tháng Chín 27, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: Làm tính chia
a) (25x^5 – 10x^4 + 20x²): 5x²
b) (-4x^5 +3x² – 4x^3): 2x^2
c) (5x²y² +12x^2y^3 – 10:xy): 5.xy
d) (2x^4 –13x^3 +15x² +11x – 3):(x² – 4x -3)
Giúp em với ạ

Comments ( 1 )

  1. truongankimtrong
    truongankimtrong
    27 Tháng Chín, 2022 at 7:50 chiều
    Reply
    Giải đáp:+Lời giải và giải thích chi tiết:
    a, (25x^5 – 10x^4 + 20x^2) : 5x^2
    = 25x^5 : 5x^2 – 10x^4 : 5x^2 + 20x^2 : 5x^2
    = 5x^3 – 2x^2 + 4
    b, (-4x^5 + 3x^2 – 4x^3) : 2x^2
    = -4x^5 : 2x^2 + 3x^2 : 2x^2 – 4x^3 : 2x^2
    = -2x^3 + 3/2 – 2x
    = -2x^3 – 2x + 3/2
    c, (5x^2 y^2 + 12x^2 y^3 – 10xy) : 5xy
    = 5x^2 y^2 : 5xy + 12x^2 y^3 : 5xy – 10xy : 5xy
    = xy + 12/5 xy^2 – 2
    d, (2x^4 – 13x^3 + 15x^2 + 11x – 3) : (x^2 – 4x – 3)
    = (2x^4 – 8x^3 – 6x^2 – 5x^3 + 20x^2 + 15x + x^2 – 4x – 3) : (x^2 – 4x – 3)
    = [(2x^4 – 8x^3 – 6x^2) – (5x^3 – 20x^2 – 15x) + (x^2 – 4x – 3)] : (x^2 – 4x – 3)
    = [2x^2 (x^2 – 4x – 3) – 5x(x^2 – 4x – 3) + (x^2 – 4x – 3)] : (x^2 – 4x – 3)
    = (x^2 – 4x – 3)(2x^2 – 5x + 1) : (x^2 – 4x – 3)
    = 2x^2 – 5x + 1

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

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