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

Toán Lớp 4: tìm x biết: a )49: x +56 : x =7 b) (390:x – 90: x)=3

Toán Lớp 4: tìm x biết:
a )49: x +56 : x =7 b) (390:x – 90: x)=3

Comments ( 2 )

  1. a, 49 : x + 56 : x = 7
      (49 + 56) : x = 7
      105 : x = 7
      x = 105 : 7
      x = 15
    Vậy x = 15
    b, 390 : x – 90 : x = 3
      (390 – 90) : x = 3
      300 : x = 3
      x = 300 : 3
      x = 100
    Vậy x = 100
     

  2. a) 49 : x + 56 : x = 7
    ( 49 + 56 ) : x = 7
    105 : x = 7
    x = 105 : 7
    x = 15
    b) 390 : x – 90 : x = 3
    ( 390 – 90 ) : x = 3
    300 : x = 3
    x = 300 : 3
    x = 100
     

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