( \(7^{1997}\)- \(7^{1995}\)) : ( 7.\(7^{1994}\))
( 7^1997 - 7^1995) : (7^1994 x 7)
\(\left(7^{1997}-7^{1995}\right)\div\left(7^{1994}\times7\right)\)
\(=\left(7^{1997}-7^{1995}\right)\div7^{1995}\)
\(=7^{1997}\div7^{1995}-7^{1995}\div7^{1995}\)
\(=7^2-1\)
\(=48\)
P/s tham khảo nha
= 48 =)))))))))))))))))
Tính
b, (71997-71995):(71994.7)
(71997-71995):(71994.7) = (71997-71995):71995 = 71997 : 71995 - 71995 : 71995 = 72 : 1 = 49
(71997-71995):(71994.7)
=(71997-71995): 71995
=71997:71995-71995:71995
=72:1
=49:1=49
CHÚC BẠN HỌC GIỎI!!
(71997-71995):(71994)(ai làm dc mình tick cho:D)
= 71997 : 71994 - 71995 : 71994
= 73 - 71
= 343 - 7
= 336
Nhanh len,mai la hét han rui,ai tra lỏi minh cho
Bài 1
(7 mũ 1997 - 7 mũ 1995) : (7 mũ 1994 . 7)
Ai giải dc mik tặng 3 tick nha nhớ giải ra nha
(7 mũ 1997 - 7 mũ 1995):(7 mũ 1994.7)=(7 mũ 1997 - 7 mũ 1995):7 mũ 1995=7 mũ 1997: 7 mũ 1995 - 7 mũ 1995 : 7mũ 1995= 7 mũ 2 -1=49-1=48
\(\left(7^{1997}-7^{1995}\right)\div\left(7^{1994}.7\right)\)
\(=\left(7^{1997}-7^{1995}\right)\div7^{1995}\)
\(=7^{1997}\div7^{1995}-7^{1995}\div7^{1995}\)
\(=7^2\div1\)
\(=49\div1\)
\(=49\)
M= 1-2-3+4+5-6-7+8+...........+1993-1994-1995+1996+1997.
Tính nhanh
a) 3/5 + 6/11 + 7/13 + 2/5 + 16/11 + 19/13 =
b) 1995/1997 + 1990/1993 + 1997/1994 + 1993/1995 + 997/995
tính nhanh :
a 3/6 + 6/11 + 7/13 + 2/5 + 16/11 + 19/13
b 1995/1997*1990/1993 * 1997/1994 * 1993/1995 * 997/995
Tinh nhanh: M=1-2-3+4+5-6-7+8+...+1993-1994-1995+1996+1997
Tính nhanh: M=1-2-3+4+5-6-7+8+...+1993-1994-1995+1996+1997
(1-2-3+4)+(5-6-7+8)+.....+(1993-1994-1995+1996)+1997
=0+0+....+0+1997
=1997