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

Toán Lớp 7: a) |1-x|-2=5 b) 6/5x – 3/4 = 7/15 c) 3/4 + | x + 1/2 | = ( 2018 / 2019 ) ^ 0 d) 4/5 : x = 5/6 : 2/3 e) X / -12 = -3/x

Tháng Sáu 12, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: a) |1-x|-2=5
b) 6/5x – 3/4 = 7/15
c) 3/4 + | x + 1/2 | = ( 2018 / 2019 ) ^ 0
d) 4/5 : x = 5/6 : 2/3
e) X / -12 = -3/x

Comments ( 2 )

  1. maitrucloan
    maitrucloan
    12 Tháng Sáu, 2022 at 8:11 chiều
    Reply
    a)|1-x|-2=5$\\$|1-x|=7$\\$1-x=\pm7$\\$\(\left[ \begin{array}{l}1-x=7\\1-x=-7\end{array} \right.\)<=>\(\left[ \begin{array}{l}x=-6\\x=8\end{array} \right.\)$\\$Vậy x\in{-6;8}
    b)6/5x-3/4=7/15$\\$6/15x=73/60$\\$x=73/24$\\$Vậy x=73/24
    c)3/4+|x+1/2|=(2018/2019)^0$\\$<=>3/4+|x+1/2|=1$\\$<=>|x+1/2|=1/4$\\$<=>x+1/2=\pm1/4$\\$TH1:x+1/2=1/4$\\$<=>x=-1/4$\\$TH2:x+1/2=-1/4$\\$<=>x=-3/4$\\$Vậy x\in{-1/4;-3/4}
    d)4/5:x=5/6:2/3$\\$<=>4/5:x=5/4$\\$<=>x=16/25$\\$Vậy x=16/25
    e)x/-12=-3/x$\\$<=>x^2=36$\\$<=>x=\pm6$\\$Vậy x=\pm6

  2. tuyen98
    tuyen98
    12 Tháng Sáu, 2022 at 8:10 chiều
    Reply
    a) |1 – x| – 2 = 5
    |1 – x| = 5 + 2
    |1 – x| = 7
    \(\left[ \begin{array}{l}1-x=7\\1-x=(-7)\end{array} \right.\)
    \(\left[ \begin{array}{l}x=1 – 7\\x=-7 – 1\end{array} \right.\)
    \(\left[ \begin{array}{l}x=-6\\x=-8\end{array} \right.\)
    b) 6/5x – 3/4 = 7/15
    6/5x = 7/15 + 3/4
    6/5x = 73/60
    x = 73/60 : 6/5
    x = 73/72
    c) 3/4 + |x + 12| = (2018/2019)^0
    3/4 + |x + 12| = 1
    |x + 12| = 1 – 3/4
    |x + 12| = 1/4
    $\left[\begin{matrix} x+12=\dfrac{1}{4}\\ x+12=\dfrac{-1}{4}\end{matrix}\right.$
    $\left[\begin{matrix} x=\dfrac{1}{4}-12\\ x=\dfrac{-1}{4}-12\end{matrix}\right.$
    $\left[\begin{matrix} x=\dfrac{-47}{4}-\\ x=\dfrac{-49}{4}\end{matrix}\right.$
    d) 4/5 : x = 5/6 : 2/3
    4/5 : x = 5/4
    x = 5/4 . 4/5
    x = 1
    e) x/(-12) = (-3)/x
    x . x = (-12) . (-3)
    x^2 = 36
    x^2 = 6^2
    \(\left[ \begin{array}{l}x=6\\x=-6\end{array} \right.\)

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

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