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

Toán Lớp 4: x + x + x + x + x + x + y + y + y + y + y + y.Biết x + y =20 Mong mọi người giúp đỡ ạ

Toán Lớp 4: x + x + x + x + x + x + y + y + y + y + y + y.Biết x + y =20
Mong mọi người giúp đỡ ạ

Comments ( 2 )

  1.     x + x + x + x + x + x + y + y + y + y + y + y
    = ( x + y ) + ( x + y ) + ( x + y ) + ( x + y ) + ( x + y ) + ( x + y )
    = 6 x  ( x + y )
     Thay x + y = 20 , ta có :
      6 x 20 = 120
      Đáp số : 120
     

  2. $\text{ x + x + x + x + x + x + y + y + y + y + y + y }$
    = ( x + x + x + x + x + x ) + ( y + y + y + y + y + y ) 
    = 6 × x + 6 × y 
    = 6 × ( x + y ) 
    Thay x + y = 20
    6 × 20
    = 120 

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