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

Toán Lớp 8: A) 6x .(2x+4x²)-3 .(2x²+3x³)+1 B) 2/3x² (3/2x +3/4)-x.(x²+x+2) C) (3x²-6x+2).2x – x .(2x²-3x +4)

Home/ Toán Lớp 8: A) 6x .(2x+4x²)-3 .(2x²+3x³)+1 B) 2/3x² (3/2x +3/4)-x.(x²+x+2) C) (3x²-6x+2).2x – x .(2x²-3x +4)

Toán Lớp 8: A) 6x .(2x+4x²)-3 .(2x²+3x³)+1 B) 2/3x² (3/2x +3/4)-x.(x²+x+2) C) (3x²-6x+2).2x – x .(2x²-3x +4)

Tháng Mười Hai 22, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: A) 6x .(2x+4x²)-3 .(2x²+3x³)+1
B) 2/3x² (3/2x +3/4)-x.(x²+x+2)
C) (3x²-6x+2).2x – x .(2x²-3x +4)

Comments ( 2 )

  1. tuyen98
    tuyen98
    22 Tháng Mười Hai, 2022 at 2:40 chiều
    Reply
    Giải đáp+Lời giải và giải thích chi tiết:
     A = 6x(2x + 4x²) – 3(2x² + 3x³) + 1
        = 12x² + 24x³ – 6x² – 9x³ + 1
       = 15x³ + 6x² + 1
    B = $\frac{2}{3}$ x²($\frac{3}{2}$ x + $\frac{3}{4}$) – x(x² + x + 2)
       = x³ + $\frac{1}{2}$ x² – x³ – x² – 2x
      = $\frac{-1}{2}$ x² – 2x
    C = (3x² – 6x + 2).2x – x(2x² – 3x + 4)
       = 6x³ – 12x² + 4x – 2x³ + 3x² – 4x
       = 4x³ – 9x²

  2. baoquyen
    baoquyen
    22 Tháng Mười Hai, 2022 at 2:39 chiều
    Reply
    a)
    6x(2x + 4x^2) – 3(2x^2 + 3x^3) + 1
    = 12x^2 + 24x^3 – 6x^2 – 9x^3 + 1
    = 6x^2 + 15x^3 + 1
    b)
    2/3x^2(3/2x + 3/4) – x(x^2 + x + 2)
    = x^3 + 1/2x^2 – x^3 – x^2 – 2x
    = -1/2x^2 – 2x
    c)
    (3x^2 – 6x + 2) . 2x – x(2x^2 – 3x + 4)
    = 6x^3 – 12x^2 + 4x – 2x^3 + 3x^2 – 4x
    = 4x^3 – 9x^2

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

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