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1998 x 1997 - 2= 3990006-2 = 3990004
1996 + 1996 x1998= 1996 x 1999= 3990004
\(\frac{1998x1997-2}{1996+1996x1998}=\frac{1998x\left(1996+1\right)-2}{1996+1996x1998}=\frac{1998x1996+1998-2}{1996+1996x1998}=\frac{1998x1996+1996}{1996+1996x1998}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{1997x1996-1}{1995x1997+1996}\)
\(=\frac{1995x1997+1997-1}{1995x1997+1996}\)
\(=\frac{1995x1997+1996}{1995x1997+1996}\)
\(=1\)
![](https://rs.olm.vn/images/avt/0.png?1311)
-1996x1999=1996x(1998+1)=1996x1998+1996
-1997x1998=(1996+1)x1998=1996x1998+1998
Vì vậy 1996x1999<1997x1998
![](https://rs.olm.vn/images/avt/0.png?1311)
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\(\frac{1996X1997+1998X3}{1997X1999-1997X1997}\)=\(\frac{3986012+5994}{3992003-3988009}\)=\(\frac{3992006}{3994}\)=\(\frac{1996003}{1997}\)
1996 x 1997 + 1998 x \(\frac{3}{1997}\)x 1999 - 1997 x 1997
= 3986012 + \(\frac{5994}{1997}\)x 1999 - 1997 x 1997
= 3986012 + 6000003005 x 1999 - 1997 x 1997
= 3986012 + 1199400601 - 3988009
= 1203386613 - 3988009
= 1199398604
\(1997\times1996+1\)
\(=3986012+1\)
\(=3986013\)
\(1995\times1997+1996\)
\(=3984015+1996\)
\(=3986011\)
học tốt
1997x1996+1=3986013
1995x1997+1996=3986011
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