Ta có:

   $\frac{1993 x 1994 x 1995 x 1996}{1998 x 1996 x 1995 x 1994}$  = $\frac{1993}{1998}$ 

  $\frac{2014 x 2015 x 2016 x 2017}{2019 x 2017 x 2016 x 2015}$   = $\frac{2014}{2019}$ 

 Lại có:

1 - $\frac{1993}{1998}$  = $\frac{5}{1998}$ 

1 - $\frac{2014}{2019}$  = $\frac{5}{2019}$

Ta thấy :  $\frac{5}{1998}$ > $\frac{5}{2019}$

              ⇒ $\frac{1993}{1998}$   >  $\frac{2014}{2019}$

       hay ⇒   $\frac{1993 x 1994 x 1995 x 1996}{1998 x 1996 x 1995 x 1994}$  >    $\frac{2014 x 2015 x 2016 x 2017}{2019 x 2017 x 2016 x 2015}$ T

   Xin tlhn!

Đáp án:

Giải thích các bước giải:

`(1993 xx 1994 xx 1995 xx 1996)/(1998 xx 1996 xx 1995 xx 1994)=1993/1998`

`(2014 xx 2015 xx 2016 xx 2017)/(2019 xx 2017 xx 2016 xx 2015)=2014/2019`

Ta có

`1993/1998=1 - 5/1998`

`2014/2019=1- 5/2019`

Ta có `5/1998>5/2019`

`=>1- 5/1998<1 -5/2019`

`=>1993/1998<2014/2019`

`=>(1993 xx 1994 xx 1995 xx 1996)/(1998 xx 1996 xx 1995 xx 1994)<(2014 xx 2015 xx 2016 xx 2017)/(2019 xx 2017 xx 2016 xx 2015)`