Matematika

Pertanyaan

selesaikanlah :
a) (2x - 5 / 2) + (5x + 2 / 6) = (2x + 3 / 4) - (x + 5 / 3)
b) (2 / x+ 3) + (5 / x) = (7 / x - 2)

1 Jawaban

  • a)
    (2x - 5 / 2) + (5x + 2 / 6) = (2x + 3 / 4) - (x + 5 / 3)
    (12x - 30 / 12) + (10x + 4 / 12) = (6x + 9 / 12) - (4x + 20 / 12)
    22x - 26 / 12 = 2x + 29 / 12
    22x - 26 = 2x + 29
    22 x - 2x = 29 - 26
    20x = 3
    x = 3/20

    b)
    (2 / x+ 3) + (5 / x) = (7 / x - 2)
    2x + 5x + 15 / x^2 + 3x = 
    7 / x - 2
    7x +15 / x^2 + 3x = 7 / x - 2
    7x^2 + x - 30 = 7x^2 + 21x
    20x = -30
    x = -3/2

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