Bài 1: y x 5 + y : 0,25 + y = 2020 . Bài 2 : 7/10 – 2/5 + 1 .

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1. 1/

   $y×5+y:0,25+y=2020$

   $y×5+y:\dfrac{1}{4}+y=2020$

   $y×5+y×4+y×1=2020$

   $y×(5+4+1)=2020$

   $y×10=2020$

   $y=2020:10$

   $y=202$

   2/

   $\dfrac{7}{10}-\dfrac{2}{5}+1$

   $=\dfrac{7}{10}-\dfrac{4}{10}+\dfrac{10}{10}$

   $=\dfrac{7-4+10}{10}$

   $=\dfrac{13}{10}$

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2. 1/  `y × 5 + y : 0,25 + y = 2020`

   `y × 5 + y : 1/4 + y × 1 = 2020`

   `y × 5 + y × 4 + y × 1 = 2020`

   `y × (5 + 4 + 1) = 2020`

   `y × 10 = 2020`

   `y = 2020 : 10`

   `y = 202.`

   2/ `7/10 – 2/5 + 1`

   `= 7/10 – 4/10 + 10/10`

   `= 3/10 + 10/10`

   `= 13/10.`

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