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

Toán Lớp 7: Ix+1/3I-4=-1 tim cac so x,y,z biet: x/6=y/5=z/3 va x+y-z=54

Toán Lớp 7: Ix+1/3I-4=-1
tim cac so x,y,z biet: x/6=y/5=z/3 va x+y-z=54

Comments ( 2 )

  1. ????????????????????????????????????????????????????

    toan-lop-7-i-1-3i-4-1-tim-cac-so-y-z-biet-6-y-5-z-3-va-y-z-54

  2. Bài 1 :
    | x + 1/3 | – 4 = -1
    | x + 1/3 |      = -1 + 4
    | x + 1/3 |      = 3
    TH1 :
      x + 1/3 = 3
      x           = 3 – 1/3
      x          = 8/3
    TH2 :
       x + 1/3 = -3
       x           = -3 – 1/3
       x           = -10/3
    Bài 2 :
       Áp dụng tính chất dãy tỉ số = nhau ta có :
        x/6 = y/5 = z/3 = $\frac{x + y – z }{6 + 5 – 3}$ = 54/8 = 27/4
      x/6 = 24/7 => x = 24/7 . 6 = 144/7
      y/5 = 24/7 => y = 24/7 . 5 = 100/7
    z/3 = 24/7 => z = 24/7 . 3 = 72/3
      Vậy {x ; y ; z } = { 144/7 ; 100/7 ; 72/3}
     

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