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

Toán Lớp 8: Tính: 1-4 x² 2-4x ______ : ________ x ²+4x 3x

Toán Lớp 8: Tính:
1-4 x² 2-4x
______ : ________
x ²+4x 3x

Comments ( 2 )

  1. (1-4x^2)/(x^2+4x):(2-4x)/(3x)
    =((1-2x)(1+2x))/(x(x+4)).(3x)/(2(1-2x))
    =(3(1+2x))/(2(x+4))
    =(3+6x)/(2x+8)

  2. Lời giải và giải thích chi tiết:
    (1 – 4x^2)/(x^2 + 4x) : (2 – 4x)/(3x)
    = ((1 – 2x)(1 + 2x))/(x(x + 4)) . (3x)/(2(1 – 2x))
    = (3x(1 + 2x))/(2x(x + 4))
    = (3(1 + 2x))/(2(x + 4))
    = (3 + 6x)/(2x + 8)

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

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