Tính nhanh:124x456x(810-405x2):1997
Tính bằng cách thuận tiện nhất:
124 x 456 x (810 - 405 x 2) : 1997
124x456x(810-405x2):1997
=124x456x(810-810):1997
=123x456x0:1997
=0
\(124.456.\left(810-405.2\right):1997=124.456.\left(810-810\right):1997=124.456.0:1997=0\) \(0\)
hoang van binh !hc tốt bn nhé ^_~!
124 x 456 x ( 810 - 405 x 2 ) : 1997
= 124 x 456 x ( 810 - 810 ) : 1997
= 124 x 456 x 0 : 1997
= 0
\(\Rightarrow\)kết qua = 0
tính nhanh : 1996*1997+1998*3+1994/1997*1999-1997*1997
1996 x 1997 + 1998 x 3 + 1994 / 1997 x 1999 - 1997 x 1997
= 1996 x 1997 + ( 1997 + 1 x 3 ) + 1994 / 1997 x 1999 - 1997 x 1997
= 1996 x 1998 + 1 x 3 + 1994 / 1997 x 1999 - 1997 x 1997
= 3988008 + 3 + 1994 / 1997 x 1999 - 1997 x 1997
= 3990005 / 1997 x 1999 - 1997 x 1997
= 3990005 / ( 1999 - 1997 ) x 1997
= 3990005 / 3994
đáp án bằng : 1,109629008840861 nha bạn mk nha
Tính nhanh :
( 1996 * 1997 + 1998 * 3 ) : ( 1997 * 1999 - 1997 * 1997 )
( 1996 * 1997 + 1998 * 3 ) : ( 1997 * 1999 - 1997 * 1997 ) = 999,500751
1997 x 1996 - 995
_______________
1995 x 1997 + 1002 Tính nhanh
\(∘Anya\)
\(=\dfrac{\text{1997 × 1996 − 995}}{\text{1995 × 1997 + 1002 }}\)
\(=\dfrac{\text{1997 × ( 1995 + 1 ) − 995}}{\text{1995 × 1997 + 1002}}\)
\(=\dfrac{\text{1997 × 1995 + 1997 − 995}}{\text{1995 × 1997 + 1002}}\)
\(=\dfrac{\text{1997 × 1995 + 1002}}{\text{1995 × 1997 + 1002 }}=1\)
Tính nhanh:
\(\dfrac{1988\times1996+1997+1985}{1997\times1996-1995\times1996}\)
\(\dfrac{1988\:×\:1996\:+\:1997\:+\:1985}{1997\:×\:1996\:-\:1995\:×\:1996}\) (rút bỏ các phần tử, mẫu giống nhau)
= \(\dfrac{1988\:+\:1985}{1995\:×\:1996}\)
= (còn lại tự tính)
Tính nhanh
\(\dfrac{1996\cdot1997+1998\cdot3+1994}{1997\cdot1999-1997\cdot1997}\)
\(\dfrac{1996\cdot1997+\left(1997+1\right)\cdot3+1994}{1997\cdot\left(1999-1997\right)}\) = \(\dfrac{1996\cdot1997+3\cdot1997+1997}{1997\cdot2}\)
\(\dfrac{1997\cdot\left(1996+3+1\right)}{1997\cdot2}\) = \(\dfrac{2000}{2}\)= \(1000\)
tính nhanh
( 1997* 1996-1) : ( 1995*1997+1996)
( 1997 x 1996 - 1 ) : ( 1995 x 1997 + 1996 )
= 3986011 : 3986011
= 1
Tính nhanh:
1997*1996 - 955
1995*1997 + 1002
Tính nhanh: a) 1988*1996+1997+1985/1997*1996-1995*1996 b) 989898/454545 - 31313131/15151515