\(\dfrac{1998.1996+1997+1995}{1997.1996-1995.1996}\)

\(=\dfrac{1998.1996}{1997.1996-1995.1996}+\dfrac{1997+1995}{1997.1996-1995.1996}\)

\(=\dfrac{1998.1996}{1996\left(1997-1995\right)}-\dfrac{1997-1995}{1996\left(1997-1995\right)}\)

\(=\dfrac{1998}{1997-1995}-\dfrac{1}{1996}\)

\(=\dfrac{1998}{2}-\dfrac{1}{1996}\)

\(=999-\dfrac{1}{1996}\)

\(\approx998,99\)

1000

1988/1996

Hok tốt !!

=\(\frac{1988x1996+1996+1996}{1996x\left(1997-1995\right)}\)=\(\frac{1996x\left(1988+2\right)}{1996x2}\)

=\(\frac{1996x1990}{1996x2}\)=\(\frac{1990}{2}\)=\(995\)

Hello!!!

= (1988 x 1996 + 1997 x 11 + 1985) : (1997 x 1996 - 1995 x 1996)  

= (1988 x 1996 + (1996 + 1) x 11 + 1985) : (1996 x (1997 - 1995))

= (1988 x 1996 + 1996 x 11 + (11 + 1985)) : (1996 x 2)

= (1996 x (1988 + 11) + 1996 : (1996 x 2)

= (1996 x 1999 + 1996) : (1996 x 2)

= (1996 x 1999 + 1996 x 1) : (1996 x 2)

= (1996 x (1999 + 1)) : (1996 x 2)

= 1996 x 2000 : 1996 x 2 

= 2000 : 2

= 1000.

-1997*1996+1/-1995*(-1997)+1996

=-1997*(1995+1)+1/-1*1995*(-1)*1997+1996

=-1997*1995+(-1997)+1/1995*1997+1996

=-1*1997*1995+(-1996)/1995*1997+1996

=-1

1998x1996+1997x11+1985/1997x1996-1995x1996  =  2939,00600901352028042063094642 (sử dụng máy tính là nhanh nhất)

\(\dfrac{1998\times1996+1997\times11+1985}{1997\times1996-1995\times1996}\\ =\dfrac{1998\times1996+\left(1996+1\right)\times11+1985}{\left(1997-1995\right)\times1996}\\ =\dfrac{1998\times1996+1996\times11+11+1985}{2\times1996}\\ =\dfrac{1996\times1998+1996\times11+1996}{2\times1996}\\ =\dfrac{1996\times\left(1998+11+1\right)}{2\times1996}\\ =\dfrac{1996\times2010}{2\times1996}\\ =\dfrac{2010}{2}\\ =1005\)

 ta có :

\(\frac{1998x1996+1997x11+1985}{1997x1996-1995x1996}\)= \(\frac{1998x1996+1996x11+11+1985}{1996x\left(1997-1995\right)}\)= \(\frac{1996x\left(1998+11+1\right)}{1996x2}\)=\(\frac{2010}{2}=1005\)

vậy giá trị cần tìm là 1005

1998x1996+1997x11+1985/1997x1996-1995x1996

=1998x1996+(1996+1)x11+1985/1996x(1997-1995)

=1998x1996+1996x11+11+1985/1996x2

=1998x1996+1996x11+1996/1996x2

=1996x(1998+11+1)/1996x2

=2010/2

=1005

mình có kết quả như Đăng Anh Thư