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

Toán Lớp 6: 12 + ( 2x – 11 ) =53 21 – ( -6 + 3x ) =9 – ( 2x + 4 ) + 11 = -27 ( 2x + 10 ) .2x = 0

Toán Lớp 6: 12 + ( 2x – 11 ) =53
21 – ( -6 + 3x ) =9
– ( 2x + 4 ) + 11 = -27
( 2x + 10 ) .2x = 0

Comments ( 2 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    12+(2x-11)=53
    <=> 2x-11=53-12
    <=> 2x-11=41
    <=> 2x=41+11
    <=> 2x=52
    <=> x=52:2
    <=> x=26
    Vậy x=26
    21-(-6+3x)=9
    <=> – 6+3x=21-9
    <=> -6+3x=12
    <=> 3x=12+6
    <=> 3x=18
    <=> x=18:3
    <=> x=6
    Vậy x=6
    -(2x+4)+11=-27
    <=> -(2x+4)=-27-11
    <=> -(2x+4)=-38
    <=> 2x+4=38
    <=> 2x=38-4
    <=> 2x=34
    <=> x=34:2
    <=> x=17
    Vậy x=17
    (2x+10).2x=0
    <=> 2(x+5).2x=0
    <=> 4x(x+5)=0
    <=> [(x=0),(x+5=0):}
    <=> [(x=0),(x=-5):}
    Vậy x \in {0;-5}

  2. 12 + ( 2x – 11 ) = 53
    ⇔ 12 + 2x – 11 = 53
    ⇔ 1 + 2x = 53
    ⇔ 2x = 53 – 1
    ⇔ 2x = 52
    ⇔ x = 52 : 2
    ⇔ x = 26
    Vậy x = 26
    21 – ( – 6 + 3x ) = 9
    ⇔ 21 + 6 – 3x = 9
    ⇔ 27 – 3x = 9
    ⇔ – 3x = 9 – 27
    ⇔ – 3x = – 18
    ⇔ x = – 18 : ( – 3 )
    ⇔ x = 6
    Vậy x = 6
    – ( 2x + 4 ) + 11 = – 27
    ⇔ – 2x – 4 + 11 = – 27
    ⇔ – 2x – 4 + 11 = – 27
    ⇔ – 2x + 7 = – 27
    ⇔ – 2x = – 27 – 7
    ⇔ – 2x = – 34
    ⇔ x = – 34 : ( – 2 )
    ⇔ x = 17
    Vậy x = 17
    ( 2x + 10 ) . 2x = 0
    ⇔ ( 2x + 10 ) . x = 0
    ⇔ \(\left[ \begin{array}{l}x=0\\2x+10=0\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}x=0\\2x=-10\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}x=0\\x=-10:2\end{array} \right.\) 
    ⇔ \(\left[ \begin{array}{l}x=0\\x=-5\end{array} \right.\) 
    Vậy x = 0 ; x = – 5

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