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

Toán Lớp 6: x+ 9/-5= -7/8 b 8%. x + 6/25.x=8/11 c, 2.|x-1/2| = 9

Tháng Mười Hai 16, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: x+ 9/-5= -7/8 b 8%. x + 6/25.x=8/11
c, 2.|x-1/2| = 9

Comments ( 2 )

  1. trucoanh55
    trucoanh55
    16 Tháng Mười Hai, 2022 at 10:16 chiều
    Reply
    x + 9/-5 = -7/8
    x = -7/8 – (-9/5)
    x = 37/40
    b) 8% . x + 6/25 . x = 8/11
    2/25 . x + 6/25 . x = 8/11
    ( 2/25 + 6/25) . x = 8/11
    8/25 . x = 8/11
    x = 8/11 : 8/25
    x = 25/11
    c) 2| x – 1/2| = 9
    |x – 1/2| = 9 : 2
    |x – 1/2 | = 9/2
    ⇒ +) x – 1/2 = 9/2
    x = 9/2 + 1/2
    x = 5
    +) x – 1/2 = -9/2
    x = -9/2 + 1/2
    x = -4
    Vậy x∈ { 5 ; -4}

  2. thienthanh
    thienthanh
    16 Tháng Mười Hai, 2022 at 10:15 chiều
    Reply
    a) x + $\frac{9}{-5}$ = $\frac{-7}{8}$  
                       x           = $\frac{-7}{8}$ – $\frac{9}{-5}$
                       x          =$\frac{37}{40}$ 
    b) 8% . x + $\frac{6}{25}$ . x = $\frac{8}{11}$ 
    $\frac{8}{100}$ . x + $\frac{6}{25}$ . x = $\frac{8}{11}$ 
    ( $\frac{8}{100}$ + $\frac{6}{25}$ ) . x  = $\frac{8}{11}$ 
                        $\frac{8}{25}$ . x               = $\frac{8}{11}$ 
                                                x = $\frac{8}{11}$ : $\frac{8}{25}$
                                                x =      $\frac{25}{11}$
    c) 2 . | x – $\frac{1}{2}$ | = 9
            | x – $\frac{1}{2}$ |  = 9 : 2
            | x – $\frac{1}{2}$ |  =  $\frac{9}{2}$
    => \(\left[ \begin{array}{l}x – \frac{1}{2} = \frac{9}{2} \\x – \frac{1}{2} = – \frac{9}{2} \end{array} \right.\)       
    =>\(\left[ \begin{array}{l}x = \frac{9}{2} + \frac{1}{2}  \\x = – \frac{9}{2} + \frac{1}{2} \end{array} \right.\)  
    => \(\left[ \begin{array}{l}x  = 5  \\x = 4 \end{array} \right.\)       
    Xin hay nhất nha bạn 🙂

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

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