( 1997 x 1996 - 1 ) : ( 1995 x 1997 + 1996 )
= 3986011 : 3986011
= 1
( 1997 . 1996 - 1) : ( 1995 . 1997 + 1996 )
\(=\frac{\left(1997.1996-1\right)}{\left(1995.1997+1996\right)}\)
\(=\frac{1997.\left(1995+1\right)-1}{1995.1997+1996}\)
\(=\frac{1997.1995+1997.1-1}{1995.1997+1996}\)
\(=\frac{1997.1995+1996}{1995.1997+1996}\)
\(=1\)
( 1997 . 1996 - 1 ) : ( 1995 . 1997 + 1996 )
Gọi biểu thức :
1997 . 1996 - 1 là A
1995 . 1997 + 1996 là B
Ta có :
A = 1997 . 1996 - 1
= 1997 . ( 1995 + 1 ) - 1
= 1997 . 1995 + 1997 . 1 - 1
= 1995 . 1997 + 1996
=> A = 1995 . 1997 + 1996 = B
Nên :
( 1997 . 1996 - 1 ) : ( 1995 . 1997 + 1996 )
= ( 1995 . 1997 + 1996 ) : ( 1995 . 1997 + 1996 )
= 1
( 1997 x 1996 - 1 ) : ( 1995 x 1997 + 1996 )
= A : B
A = 1997 x 1996 - 1
A = 1997 x ( 1996 + 1 ) - 1
A = 1997 x 1995 + 1997 x 1 - 1
A = 1995 x 1997 + 1996 = B
Nên : ( 1997 x 1996 - 1 ) : ( 1995 x 1997 + 1996 )
= ( 1995 x 1997 + 1996 ) : ( 1995 x 1997 + 1996 )
k mình nha
= 1