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

Toán Lớp 7: tìm x biết: 2/3 . x – 3/12 = 4/5 – ( 7/x-2 )

Tháng Chín 12, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: tìm x biết: 2/3 . x – 3/12 = 4/5 – ( 7/x-2 )

Comments ( 1 )

  1. truongthanhhung
    truongthanhhung
    12 Tháng Chín, 2022 at 8:14 sáng
    Reply
    2/3 x – 3/(12) = 4/5 – (\frac{7}{x – 2})
    => 2/3 x + 7/(x – 2) = 4/5 + 3/(12)
    => \frac{2x – 4 + 21}{3(x – 2)} = (48)/(60) + (15)/(60)
    => \frac{2x + 17}{3(x – 2)} = (21)/(20)
    => 20(2x + 17) = 21.3(x – 2)
    => 40x + 340 = 63x – 126
    => 63x – 40x = 126 + 340
    => 13x = 466
    => x = (466)/(13)
    Vậy x = (466)/(13)

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

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