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

Toán Lớp 6: Lưu avatar Toán Học Tìm x , biết A) | x-3 | – 16 = -4 B) 26 – | x + 9 | = -13 c) | x – 1 | + 15 = 18

Toán Lớp 6: Lưu
avatar
Toán Học
Tìm x , biết
A) | x-3 | – 16 = -4
B) 26 – | x + 9 | = -13
c) | x – 1 | + 15 = 18

Comments ( 2 )

  1. Mình gửi bài ặ
    Chúc b học tốt. Xin hay nhất, tks!
    @Suziezhan

    toan-lop-6-luu-avatar-toan-hoc-tim-biet-a-3-16-4-b-26-9-13-c-1-15-18

  2. Lời giải chi tiết:
    a) |x-3|-16=-4
    =>|x-3|=-4+16
    =>|x-3|=12
    =>\(\left[ \begin{array}{l}x-3=12\\x-3=-12\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=12+3\\x=-12+3\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=15\\x=-9\end{array} \right.\)
    Vậy x=15 hoặc x=-9
    b) 26-|x+9|=-13
    =>|x+9|=26-(-13)
    =>|x+9|=39
    =>\(\left[ \begin{array}{l}x+9=39\\x+9=-39\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=39-9\\x=-39-9\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=30\\x=-48\end{array} \right.\)
    Vậy x=30 hoặc x=-48
    c) |x-1|+15=18
    =>|x-1|=18-15
    =>|x-1|=3
    =>\(\left[ \begin{array}{l}x-1=3\\x-1=-3\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=3+1\\x=-3+1\end{array} \right.\)
    =>\(\left[ \begin{array}{l}x=4\\x=-2\end{array} \right.\)
    Vậy x=4 hoặc x=-2
    @uniquetimehunter

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