giải giúp mik, mik cần gấp

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giải giúp mik, mik cần gấp
giai-giup-mik-mik-can-gap

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Vodka 5 years 2021-05-18T06:18:26+00:00 2 Answers 25 views 0

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  1. diemkieu
    0
    2021-05-18T06:19:36+00:00
    Reply

    vote5*+ctlhn nhé

    giai-giup-mik-mik-can-gap

  2. Nem
    0
    2021-05-18T06:20:14+00:00
    Reply

     A = $\dfrac{1^{2}}{1.2}$ . $\dfrac{2^{2}}{2.3}$ . $\dfrac{3^{2}}{3.4}$ . $\dfrac{4^{2}}{4.5}$ . … .$\dfrac{99^{2} }{99.100}$ 

    A = $\dfrac{1.1}{1.2}$ . $\dfrac{2.2}{2.3}$ . $\dfrac{3.3}{3.4}$ . $\dfrac{4.4}{4.5}$ . … . $\dfrac{99.99}{99.100}$ 

    A= $\dfrac{1.1.2.2.3.3.4.4. … . 99.99}{1.2.2.3.4.4.5. … . 99.100}$ 

    A = $\dfrac{(1.2.3.4. … . 99) . (1.2.3.4. … . 99)}{(1.2.3.4. … . 99) . ( 2.3.4.5. … . 100)}$ 

    A =  $\dfrac{1.2.3.4. … . 99}{2.3.4.5. … . 100}$ 

    A = $\dfrac{1}{100}$ 

    Vậy A = $\dfrac{1}{100}$ 

      

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