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

Toán Lớp 6: Giúp tôi với!!!!! 3²(x+4)-5²=5.2² , (10+2x):4²⁰¹¹ =4²⁰¹³, x+(x+1)+…+(x+10)=110, (x+7) ( 2x – 6)=0

Toán Lớp 6: Giúp tôi với!!!!! 3²(x+4)-5²=5.2² , (10+2x):4²⁰¹¹ =4²⁰¹³, x+(x+1)+…+(x+10)=110, (x+7) ( 2x – 6)=0

Comments ( 2 )

  1. $3^{2}$   ( x + 4 ) – $5^{2}$ = 5 . $2^{2}$ 
    $3^{2}$   ( x + 4 ) – $5^{2}$ = 5 . 4
    $3^{2}$   ( x + 4 ) – $5^{2}$ =  20
    $3^{2}$   ( x + 4 )  =  20  + $5^{2}$
    $3^{2}$   ( x + 4 )  =  20  +  25
    $3^{2}$   ( x + 4 )  =  40
                        x + 4   =  40 : $3^{2}$ 
                        x + 4  =  40 : 9
                        x + 4   =  5
                        x              =  5  –  4
                        x                =  1
    ( x + 7 ) ( 2x – 6 ) = 0
    X = $\frac{-4 ± -10}{2}$
    X = $\frac{-4  – 10}{2}$
    ⇒ X = 3
    ⇒ X = -7
        

  2. Bạn tham khảo!
     *3²(x+4)-5²=5.2²
    ->9(x+4)-25=5.4
    ->9(x+4)-25=20
    ->9(x+4)=20+25
    ->9(x+4)=45
    ->x+4=45:9
    ->x+4=5
    ->x=5-4
    ->x=1
    *(10+2x):$4^{2011}$ =$4^{2013}$ 
    ->10+2x=$4^{2013}$ .$4^{2011}$ 
    ->10+2x=$4^{4024}$ 
    ->2x=$4^{4024}$ -10
    ->x=$\frac{4^{4024} -10}{2}$ 
    *x+(x+1)+…+(x+10)=110
    ->x+x+1+…+x+10=110
    ->11x+(1+2+…+10)=110
    ->11x+55=110
    ->11x=110-55
    ->11x=55
    ->x=55:11
    ->x=5
    *(x+7)(2x-6)=0
    ->\(\left[ \begin{array}{l}x+7=0\\2x-6=0\end{array} \right.\) 
    ->\(\left[ \begin{array}{l}x=0-7\\2x=0+6\end{array} \right.\) 
    ->\(\left[ \begin{array}{l}x=-7\\2x=6\end{array} \right.\) 
    ->\(\left[ \begin{array}{l}x=-7\\x=6:2\end{array} \right.\) 
    ->\(\left[ \begin{array}{l}x=-7\\x=3\end{array} \right.\) 
    Chúc bạn học tốt!
    Cho mình xin 5 sao và cảm ơn nhé OvO

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