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

Toán Lớp 8: Thực hiện phép tính a) 4x(2x-1)-8x^2 b) (x+2) (2x-3) c) (x+6)^2 d) 6x^2+14

Toán Lớp 8: Thực hiện phép tính
a) 4x(2x-1)-8x^2 b) (x+2) (2x-3)
c) (x+6)^2 d) 6x^2+14x-12) (3x-2)

Comments ( 2 )

  1. a, 4x(2x -1) – 8x^2
    = 8x^2 – 4x – 8x^2
    = -4x
    b, (x+2)(2x-3)
    = 2x^2 – 3x + 4x – 6
    = 2x^2 + x -6
    c, (x+6)^2
    = x^2 + 12x + 36
    d, (6x^2 +14x – 12)(3x-2)
    = 18x^3 – 12x^2 +42x^2 – 28x – 36x + 24
    = 18x^3 + 30x^2  – 64x +24

  2. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    a) 4x ( 2x-1)-8x^2
    =8x^2 – 4x – 8x^2
    = -4x
    b) (x+2)(2x-3)
    =2x^2 – 3x + 4x – 6
    =2x^2 + 1x – 6
    c) (x+6)^2
    = (x^2 + 2 . x. 6 + 6^2)
    = x^2 + 12x + 36
    d) (6x^2 + 14x – 12)(3x-2)
    = 18x^3 + 42x^2 – 36x – 12x^2 – 28x – 24
    =18x^3 + 12x^2 + -64x – 24

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