Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, 132 + 77 + 198
= 11 x 12 + 11 x 7 + 11 x 18
= 11 x (12 + 7 + 18) ( nhân 1 số với 1 tổng)
= 11 x 37
b, 5555 + 6767 + 7878
= 55 x 101 + 67 x 101 + 78 x 101
= 55 + 67 + 78) x 101
= 200 x 101
c, 1997, 1997 + 1998, 1998 + 1999, 1999
= 1997 x 1,0001 + 1998 x 1,0001 + 1999 x 1,0001
= (1997 + 1998 + 1999) x 1,0001
= 5994 x 1,0001 ( nhân 1 tổng với 1 số)
a) 132 + 77 + 198
= 11 x 12 + 11 x 7 + 11 x 18
= 11 x ( 12 + 7 + 18 )
= 11 x 37
b) 5555 + 6767 + 7878
= 55 x 101 + 67 x 101 + 78 x 101
= ( 55 + 67 + 78 ) x 101
= 200 x 101
c) 1997, 1997 + 1998, 1998 + 1999, 1999
= 1997 x 1,0001 + 1998 x 1,0001 + 1999 x 1,0001
= ( 1997 + 1998 + 1999 ) x 1,0001
= 5994 x 1,0001.
a) 132 + 77 + 198
= 11 x 12 + 11 x 7 + 11 x 18
= 11 x ( 12 + 7 + 18 )
= 11 x 37
b) 5555 + 6767 + 7878
= 55 x 101 + 67 x 101 + 78 x 101
= ( 55 + 67 + 78 ) x 101
= 200 x 101
c) 1997, 1997 + 1998, 1998 + 1999, 1999
= 1997 x 1,0001 + 1998 x 1,0001 + 1999 x 1,0001
= ( 1997 + 1998 + 1999 ) x 1,0001
= 5994 x 1,0001.
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
\(\frac{1996\times1997+1998\times3+1994}{1997\times1999-1997\times1997}\)
= \(\frac{1996\times1997+\left(1997+1\times3\right)+1994}{1997\times1999-1997\times1997}\)
= \(\frac{1996\times1998+1\times3+1994}{1997\times1999-1997\times1997}\)
= \(\frac{3990005}{1997\times1999-1997\times1997}\)
= \(\frac{3990005}{\left(1999-1997\right)\times1997}\)
= \(\frac{3990005}{3994}\)
1 + 2 + 3 + 4 .... + 1997 + 1998 + 1999 + 2000
= (2000+1) x 2000 : 2
= 2001 x 2000 : 2
= 4002000 : 2
= 2001000
co so so hang la
(2000-1)/1+1=2000so
tong la
(2000+1)*2000/2=2001000
1997, 1997 + 1998, 1998 + 1999, 1999
= 1997 x 1,0001 + 1998 x 1,0001 + 1999 x 1,0001
= (1997 + 1998 + 1999) x 1,0001
= 5994 x 1,0001 ( nhân 1 tổng với 1 số)