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

Toán Lớp 6: Tính: a, `(3/4+4/5-5/6):(3/4-4/5+5/6)` Tìm x: `(2x-1/3).(x+5/16)=0`

Toán Lớp 6: Tính:
a, (3/4+4/5-5/6):(3/4-4/5+5/6)
Tìm x:
(2x-1/3).(x+5/16)=0

Comments ( 2 )

  1. a)
    (3/4 + 4/5 – 5/6) : (3/4 – 4/5 + 5/6)
    = (45/60 + 48/60 – 50/60)/(45/60 – 48/60 + 50/60)
    = 43/60 : 47/60
    = 43/47
    b)
    (2x – 1/3) . (x + 5/16) = 0
    ⇒ \(\left[ \begin{array}{l}2x – 1/3 = 0\\x + 5/16 = 0\end{array} \right.\) 
    ⇒ \(\left[ \begin{array}{l}x=1/6\\x=-5/16\end{array} \right.\) 
    text(Vậy x = {1/6 ; -5/16})

  2. @Kem
    Lời giải và giải thích chi tiết:
    a, (3/4 + 4/5 – 5/6) ÷ (3/4 – 4/5 + 5/6)
    = (90/120 + 96/120 – 100/120) ÷ ( 90/120 – 96/120 + 100/120)
    = 43/60 ÷ 47/60
    = 43/47
    _____________________________________________
    (2x – 1/3)(x+5/16) = 0
    ⇒ TH1: 2x – 1/3 = 0 ⇔ 2x = 1/3 ⇔ x = 1/6
    ⇒ TH2: x + 5/6 = 0 ⇔ x = -5/6

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