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

Toán Lớp 7: a ) x-3/15 = -2/5 d) 2x-1/3 = 2-x / -2

Toán Lớp 7: a ) x-3/15 = -2/5 d) 2x-1/3 = 2-x / -2

Comments ( 1 )

  1. Lời giải và giải thích chi tiết:
    a)
    x – 3/15 = (-2)/5
    -> x = (-2)/5 + 3/15
    -> x = (-2)/5 + 1/5
    -> x = (-1)/5
    Vậy  x = (-1)/5
    d)
    (2x – 1)/3 = (2 – x)/(-2)
    -> -2(2x – 1) = 3(2 – x)
    -> -4x + 2 = 6 – 3x
    -> -4x + 3x = 6 – 2
    -> -x = 4
    -> x = -4
    Vậy  x = -4

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

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