(7^1997-7^1995):(7^1994.7)
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![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có : ( 71997 - 71995 ) : ( 71994 . 7 ) =
= ( 71997 - 71995 ) : 71995
= 71997 : 71995 - 71995 : 71995
= 72 - 1
= 49 - 1 = 48
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 71995.(72-1):71995=72-1=49-1=48
b) [28+(23)3]:25+3=(28+29):28=28(1+2):28=1+2=3
gíp mình bài này với chứng minh rằng A=1/10.(7^2004^2006 -3^92^94)
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![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(7^{1997}-7^{1995}\right)\div\left(7^{1994}\times7\right)\)
\(=\left(7^{1997}-7^{1995}\right)\div7^{1995}\)
\(=7^{1997}\div7^{1995}-7^{1995}\div7^{1995}\)
\(=7^2-1\)
\(=48\)
P/s tham khảo nha
![](https://rs.olm.vn/images/avt/0.png?1311)
(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!!
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(7^{1997}-7^{1995}\right):\left(7^{1994}\cdot7\right)\)
\(=7^{1995}\cdot\left(7^2-1\right):7^{1995}\)
\(=7^2-1\)
\(=49-1\)
\(=48\)
![](https://rs.olm.vn/images/avt/0.png?1311)
= 71997 : 71994 - 71995 : 71994
= 73 - 71
= 343 - 7
= 336
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(7^{1997}-7^{1995}\right):\left(7.7^{1994}\right)\\ =\left(7^{1997}-7^{1995}\right):\left(7^{1+1994}\right)\\ =\left(7^{1997}-7^{1995}\right):7^{1995}\\ =\left(7^{1997}:7^{1995}\right)-\left(7^{1995}:7^{1995}\right)\\ =\left(7^{1997-1995}\right)-1\\ =7^2-1\\ =48\)
[7^1997 - 7^1995] : [7^1994.7]
=[7^1997 - 7^1995] : 7^1995
=7^1997 : 7^1995 - 7^1995 : 7^1995
=7^2 - 1
=48
nhớ k cho mình nhé
Thank