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

Toán Lớp 6: a, (x+3)×(2x-4)=0 b, 1000:[30+(2^x-6)]=3^2+4^2

Toán Lớp 6: a, (x+3)×(2x-4)=0
b, 1000:[30+(2^x-6)]=3^2+4^2

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    a, (x+3)×(2x-4)=0
    -> \(\left[ \begin{array}{l}x + 3 = 0\\2x – 4 = 0\end{array} \right.\) -> \(\left[ \begin{array}{l}x=-3\\2x=4\end{array} \right.\) -> \(\left[ \begin{array}{l}x=-3\\x=2\end{array} \right.\) 
    Vậy x ∈ {-3; 2}
    b, 1000  :[30+(2^x – 6)]=3^2+4^2
    1000 : [30 + (2^x – 6)] = 25
    30 + (2^x – 6) = 40
    2^x – 6 = 10
    2^x = 16
    2^x = 2^4
    -> x = 4
    Vậy x = 4
     

  2. Giải đáp:
    a) (x+3).(2x-4)=0
    => Nếu x+3=0 => x=3
          hoặc 2x-4=0 => x=4 : 2= 2
       Vậy x=- 3 hoặc x= 2

    b) 1000: [30+(2x-6)]= 3² + 4²
         1000: [24+2x]= 9 + 16
          24+2x=1000: (9+16)
          24+2x=40
          2x=40-24=16
         =>x=16:2=8
         Vậy x=8
       
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222-9+11+12:2*14+14 = ? ( )

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