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

Toán Lớp 6: a) (x – 39) -10 = 11; b) 12 – (8 – 2x ) = 6; c) 16.2x = 256; d) x(x-1)=0

Toán Lớp 6: a) (x – 39) -10 = 11; b) 12 – (8 – 2x ) = 6; c) 16.2x = 256; d) x(x-1)=0

Comments ( 2 )

  1. a) (x – 39) -10 = 11
    x-39=11+10
    x-39=21
    x=21+39
    x=60
    Vậy x=60
    b) 12 – (8 – 2x ) = 6
    8-2x=12-6
    8-2x=6
    2x=8-6
    2x=2
    x=2:2
    x=1
    Vậy x=1
    ) 16.2x = 256
    2x=256:16
    2x=16
    x=16:2
    x=8
    Vậy x=8
    d) x(x-1)=0
    =>x=0 hoặc x=1
    Nếu x=0
    x(x-1)=0
    0.(0-1)=0(loại)
    Nếu x-1=0
    x(x-1)=0
    1(1-1)=0
    1.0=0(nhận)

  2. Giải đáp + Lời giải và giải thích chi tiết:
     a, (x-39)-10=11
    <=> x-39 = 21
    <=> x=60
    Vậy x=60
    b, 12-(8-2x)=6
    <=> 12-8+2x=6
    <=> 2x = 6-12+8
    <=> 2x=2
    <=> x=1
    Vậy x=1
    c, 16.2x=256
    <=> 2x=16
    <=> x=8
    Vậy x=8
    d, x(x-1)=0
    <=> \(\left[ \begin{array}{l}x=0\\x-1=0\end{array} \right.\) 
    <=> \(\left[ \begin{array}{l}x=0\\x=1\end{array} \right.\) 
    Vậy x=1;x=0 

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