tính nhanh
( 1997* 1996-1) : ( 1995*1997+1996)
Tính nhanh:
1988 x 1996 + 1997 + 1995
1997 x 1996 - 1995 x 1996
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
\(\frac{1997\times1996-1}{1995\times1997+1996}=\frac{1997\times\left(1995+1\right)-1}{1995\times1997+1996}=\frac{1997\times1995+1997-1}{1995\times1997+1996}\)
\(=\frac{1997\times1995+1996}{1995\times1997+1996}=1\)
Tính nhanh biểu thức sau:
A= 1998*1996+1997*11+1985/1997*1996-1995*1996
B1:Tính nhanh
1997 x 1996 - 1 / 1995 x 1997 +1996
Mình xin câu trả lời đúng nhất nhaa
\(\dfrac{1997\times1996-1}{1995\times1997+1996}\)
= \(\dfrac{1997\times\left(1995+1\right)-1}{1995\times1997+1996}\)
= \(\dfrac{1997\times1995+1997-1}{1995\times1997+1996}\)
= \(\dfrac{1995\times1997+1996}{1995\times1997+1996}\)
= 1
Tính nhanh :
1998 . 1996 + 1997 . 11 + 1985
----------------------------------------------
1997 .1996 - 1995 . 1996
Ta có : ( 1998 * 1996 + 1997 * 11 + 1985 ) / ( 1997 * 1996 - 1995 * 1996 ) .
= ( 1998 * 1997 - 1998 + 1997 * 11 + 1985 ) / 1996 * ( 1997 - 1995 ) .
= [ 1997 * ( 1998 + 11 ) - 1998 + 1985 ] / 1996 * 2 .
= [ 1997 * 2009 - 13 ] / 1996 * 2 .
= [ 1996 * 2009 + 2009 - 13 ] / 1996 * 2 .
= [ 1996 * 2009 + 1996 ] / 1996 * 2 .
= [ 1996 * ( 2009 + 1 ) / 1996 * 2 .
= 1996 * 2010 / 1996 * 2 .
= 1005 .
Bài 1
a ) Tính nhanh
1997 x 1996 - 1 / 1995 x 1997 +1996
mẫu số
:1997x1996-1
1997x(1995+1)-1
1997x1995+1997x1-1
1997x1995+1997-1
1997x1995+1996
->1997x1996-1/1995x1997+1996
l i k e nhé
Bạn Huy Hoàng làm đúng đó mình đã làm bài này rồi.Chúc bạn làm bài tốt.
tiinh nhanh
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) \(\dfrac{1997x1996-995}{1995x1997+1002}=\dfrac{1997x\left(1995+1\right)-995}{1995x1997+1002}\)
\(=\dfrac{1997x1995+1997-995}{1995x1997+1002}=\dfrac{1997x1995+1002}{1995x1997+1002}=1\)