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

Toán Lớp 6: 8) (−24 + ????) − 43 = 15 9) (−???? + 6) + 12 = 48 10) (−17). ???? − 135 = −101 11) (−3). ???? + 5. ???? = −4 − 2 12) (2???? − 4)(???? + 3) = 0 13) (

Home/ Toán Lớp 6: 8) (−24 + ????) − 43 = 15 9) (−???? + 6) + 12 = 48 10) (−17). ???? − 135 = −101 11) (−3). ???? + 5. ???? = −4 − 2 12) (2???? − 4)(???? + 3) = 0 13) (

Toán Lớp 6: 8) (−24 + ????) − 43 = 15 9) (−???? + 6) + 12 = 48 10) (−17). ???? − 135 = −101 11) (−3). ???? + 5. ???? = −4 − 2 12) (2???? − 4)(???? + 3) = 0 13) (

Tháng Tám 20, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: 8) (−24 + ????) − 43 = 15
9) (−???? + 6) + 12 = 48
10) (−17). ???? − 135 = −101
11) (−3). ???? + 5. ???? = −4 − 2
12) (2???? − 4)(???? + 3) = 0
13) (???? − 3)2 = 25
14) (2???? − 1)3 = −125
15) 5.5x  625

Comments ( 2 )

  1. phuongthuydung
    phuongthuydung
    20 Tháng Tám, 2022 at 2:33 sáng
    Reply
    #andy
    \[\begin{array}{l}
    {\rm{8)}}\\
    {\rm{( –  24  +  x)  –  43  =  15}}\\
     \Leftrightarrow  – {\rm{ }}24{\rm{ }} + {\rm{ }}x{\rm{ }} = {\rm{ }}58\\
     \Leftrightarrow x{\rm{ }} = {\rm{ }}82\\
    {\rm{9) ( –  x  +  6)  +  12  =  48}}\\
     \Leftrightarrow 6{\rm{ }} – {\rm{ }}x{\rm{ }} = {\rm{ }}36\\
     \Leftrightarrow x{\rm{ }} = {\rm{ }} – {\rm{ }}30\\
    10){\rm{ }}\left( { – {\rm{ }}17} \right)x{\rm{ }} – {\rm{ }}135{\rm{ }} = {\rm{ }} – {\rm{ }}101\\
     \Leftrightarrow  – {\rm{ }}17x{\rm{ }} = {\rm{ }}34\\
     \Leftrightarrow {\rm{x  = }}\dfrac{{ – 34}}{{17}}\\
    11){\rm{ }}\left( { – {\rm{ }}3} \right)x{\rm{ }} + {\rm{ }}5.x{\rm{ }} = {\rm{ }} – {\rm{ }}4{\rm{ }} – {\rm{ }}2\\
     \Leftrightarrow  – {\rm{ 3x  +  5x  =   –  6}}\\
     \Leftrightarrow {\rm{2x  =  6}}\\
     \Leftrightarrow x{\rm{ }} = {\rm{ }}3\\
    {\rm{12) (2x  –  4)(x  +  3)  =  0}}\\
     \Leftrightarrow \left[ \begin{array}{l}
    2x – 4 = 0\\
    x + 3 = 0
    \end{array} \right. \Leftrightarrow \left[ \begin{array}{l}
    x = 2\\
    x =  – 3
    \end{array} \right.\\
     \Rightarrow S \in \{ 2; – 3\} \\
    13){\rm{ (x  –  3)}}{\rm{.2  =  25}}\\
     \Leftrightarrow 2x{\rm{ }} – {\rm{ }}6{\rm{ }} = {\rm{ }}25\\
     \Leftrightarrow 2x{\rm{ }} = {\rm{ }}31\\
     \Leftrightarrow {\rm{x  = }}\dfrac{{31}}{2}\\
    {\rm{14) (2x –  1)}}{\rm{.3  =   –  125}}\\
     \Leftrightarrow 6x{\rm{ }} – {\rm{ }}3{\rm{ }} = {\rm{ }} – {\rm{ }}125\\
     \Leftrightarrow 6x{\rm{ }} = {\rm{ }} – {\rm{ }}122\\
     \Leftrightarrow {\rm{x  = \;}}\dfrac{{ – 122}}{6}\\
    15){\rm{ }}5.5x{\rm{ }} = {\rm{ }}625\\
     \Leftrightarrow 25x{\rm{ }} = {\rm{ }}625\\
     \Leftrightarrow {\rm{x  =  125}}
    \end{array}\]

  2. tuyetnhungthu
    tuyetnhungthu
    20 Tháng Tám, 2022 at 2:32 sáng
    Reply
    $\text{8) (- 24 + x) – 43 = 15}$
    <=> $\text{- 24 + x = 15 + 43}$
    <=> $\text{- 24 + x = 58}$
    <=> $\text{x = 58 – (- 24)}$
    <=> $\text{x = 58 + 24}$
    <=> $\text{x = 82}$
    Vậy $\text{x = 82}$
    $\text{9) (- x + 6) + 12 = 48}$
    <=> $\text{- x + 6 = 48 – 12}$
    <=> $\text{6 – x = 36}$
    <=> $\text{x = 6 – 36}$
    <=> $\text{x = – 30}$
    Vậy $\text{x = – 30}$
    $\text{10) (- 17)x – 135 = – 101}$
    <=> $\text{- 17x = – 101 + 135}$
    <=> $\text{- 17x = 34}$
    <=> $\text{x = 34 : (- 17)}$
    <=> $\text{x =}$ $\dfrac{- 34}{17}$
    Vậy $\text{x =}$ $\dfrac{- 34}{17}$
    $\text{11) (- 3)x + 5.x = – 4 – 2}$
    <=> $\text{- 3x + 5x = – 6}$
    <=> $\text{2x = 6}$
    <=> $\text{x = 3}$
    Vậy $\text{x = 3}$
    $\text{12) (2x – 4)(x + 3) = 0}$
    => $\left[\begin{matrix} 2x – 4 = 0\\ x + 3 = 0\end{matrix}\right.$
    <=> $\left[\begin{matrix} 2x = 4\\ x = – 3\end{matrix}\right.$
    <=> $\left[\begin{matrix} x = 2\\ x = – 3\end{matrix}\right.$
    Vậy x = 2 hoặc x = – 3
    $\text{13) (x – 3).2 = 25}$
    <=> $\text{2x – 6 = 25}$
    <=> $\text{2x = 25 + 6}$
    <=> $\text{2x = 31}$
    <=> $\text{x =}$ $\dfrac{31}{2}$
    Vậy $\text{x =}$ $\dfrac{31}{2}$
    $\text{14) (2x – 1).3 = – 125}$
    <=> $\text{6x – 3 = – 125}$
    <=> $\text{6x = – 125 + 3}$
    <=> $\text{6x = – 122}$
    <=> $\text{x = (- 122) : 6}$
    <=> $\text{x = }$ $\dfrac{- 122}{6}$
    Vậy $\text{x = }$ $\dfrac{- 122}{6}$
    $\text{15) 5.5x = 625}$
    <=> $\text{25x = 625}$
    <=> $\text{x = 125}$
    Vậy $\text{x = 125}$
    #Ling

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

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