2020×(1/2021- 2019/1010) – 2019×(1/2021- 2)

0 bình luận về “2020×(1/2021- 2019/1010) – 2019×(1/2021- 2)”

1. `2020 xx (1/2021 – 2019/1010) – 2019 xx (1/2021 – 2)`

   `= 2020/2021 – (2020 xx 2019)/1010 – 2019/2021 + 2019 xx 2`

   `= (2020/2021 – 2019/2021) – ((2020 xx 2019)/1010 – 2019 xx 2)`

   `= 1/2021 – (2 xx 2019 – 2019 xx 2)`

   `= 1/2021 – 0 = 1/2021`

    

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2. Đáp án:

    

   Giải thích các bước giải:

     2020×($\frac{1}{2021}$ – $\frac{2019}{1010}$ ) – 2019×($\frac{1}{2021}$ – 2)

   = $\frac{2020}{2021}$  – 4038 – $\frac{2019}{2021}$  + 4038

   = $\frac{1}{2021}$ 

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