a,2006:y+1955=2014 b,yx35-35=1225 c,981x(y+189)=185409

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1. Đáp án:

    

   `a)`

   `2006 : y + 1955 = 2014`

   ` 2006 : y =2014 – 1955`

   ` 2006 : y= 59`

   ` y = 2006:59` 

   ` y =34`

   `b)`

   `y \times 35 – 35 = 1225`

   ` 35 \times ( y -1) = 1225`

   ` y – 1= 1225 : 35`

   ` y -1 =35`

   ` y = 35+1`

   ` y =36`

   `c)`

   `  981 \times (y+189) = 185409`

   ` y + 189 = 185409 : 981`

   ` y +189 = 189`

   ` y = 189 – 189`

   ` y =0`

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2. `2006:y+1955=2014`

   `=> 2006:y=2014-1955`

   `=> 2006:y=59`

   `=> y=2006:59`

   `=> y = 34`

   `y` x `35-35=1225`

   `=> y` x `35=1225+35`

   `=> y` x `35 = 1260`

   `=> y = 1260 : 35`

   `=> y = 35`

   `981` x `(y+189)=185409`

   `=> y+189 = 185409 : 981`

   `=> y+189 = 189`

   `=> y = 189 – 189`

   `=> y=0`

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