tìm y a}8,75 * y + 1,25 * Y b}175,5 – [ y + 120 ] = 6,75 + 3,5

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1. $\text { Đáp án: }$

   $\text { a) 8,75 × y + 1,25 × y  }$

   $\text { => y × (8,75 + 1,25) = 0 }$

   $\text { => y × 10 = 0 }$

   $\text { => y = 0 : 10 }$

   $\text { => y = 0. }$

   $\text { b) 175,5 – [y + 120] = 6,75 + 3,5 }$

   $\text { => 175,5 – [y + 120] = 10,25 }$

   $\text { => y + 120 = 175,5 – 10,25 }$

   $\text { => y + 120 = 165,25 }$

   $\text { => y = 165,25 – 120 }$

   $\text { => y = 45,25. }$

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2. a) `8,75×y + 1,25×y =0`

   `y× ( 8,75 + 1,25 ) = 0`

   `y × 10 =0`

   `y=0`

   b) `175,5 – (y+120) = 6,75+3,5`

   `175,5 – (y+120) = 10,25`

   `y+120 = 175,5 – 10,25`

   `y+120 = 165,25`

   `y=165,25-120`

   `y=45,25`

    

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