tính
-1997 * 1996 + 1 / (-1995) * (- 1997) 1996
a,1997 x 1996 - 1
----------------------------
1995 x 1997 + 1996
b,1997 x 1996 - 995
-----------------------------------------
1995 x 1997 + 1002
giúp em với ạ
a) \(\dfrac{1997x1996-1}{1995x1997+1996}=\dfrac{1997x\left(1995+1\right)-1}{1995x1997+1996}\)
\(=\dfrac{1997x1995+1997-1}{1995x1997+1996}=\dfrac{1997x1995+1996}{1995x1997+1996}=1\)
b) \(\dfrac{1997x1996-995}{1995x1997+1002}=\dfrac{1997x\left(1995+1\right)-995}{1995x1997+1002}\)
\(=\dfrac{1997x1995+1997-995}{1995x1997+1002}=\dfrac{1997x1995+1002}{1995x1997+1002}=1\)
tính nhanh
( 1997* 1996-1) : ( 1995*1997+1996)
( 1997 x 1996 - 1 ) : ( 1995 x 1997 + 1996 )
= 3986011 : 3986011
= 1
Tính nhanh:
1988 x 1996 + 1997 + 1995
1997 x 1996 - 1995 x 1996
1988*1996+1997+1995/1997*1996-1995*1996
tự làm là hạnh phúc của mỗi công dân.
=>
=>
=>
=> 995
\(\frac{1988\cdot1996+1997+1995}{1997\cdot1996-1995\cdot1996}\)
=\(\frac{1996\cdot\left(1988+2\right)}{1996\cdot\left(1997-1995\right)}\)
=\(\frac{1996\cdot1990}{1996\cdot2}\)
=\(\frac{1990}{2}\)=995
1998 x 1996 + 1997 + 1995
--------------------------------------
1997 x 1996 - 1995 x 1996
Mình mới giải xong, mất tiêu bài rồi KQ=1000
Tính nhanh: a) 1988*1996+1997+1985/1997*1996-1995*1996 b) 989898/454545 - 31313131/15151515
a ) Tính nhanh
1997 x 1996 - 1 / 1995 x 1997 +1996
\(\frac{1997\times1996-1}{1995\times1997+1996}=\frac{1997\times\left(1995+1\right)-1}{1995\times1997+1996}=\frac{1997\times1995+1997-1}{1995\times1997+1996}\)
\(=\frac{1997\times1995+1996}{1995\times1997+1996}=1\)
( -1997 ) . 1996 + 1/ (-1995). (-1997) +1996
Tính nhanh biểu thức sau:
A= 1998*1996+1997*11+1985/1997*1996-1995*1996