(4^17 + 4^3) : (4^16 + 4^2 )
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[(516+416).317.310)].(24-42)
=[(516+416).317.310)].(16-16)
=[(516+416).317.310)].0
=0
Giải :
[( 516 + 416 ) . 317. 310 )] . ( 24- 42 )
= [( 516 + 416 ) . 317. 310 )] . [ 24 - ( 22 )2]
= [( 516 + 416 ) . 317. 310 )] . [ 24 - 24)
= [( 516 + 416 ) . 317. 310 )].0
= 0
\(\dfrac{4^{17}+4^3}{4^{16}+4^2}=\dfrac{4^3\left(4^{14}+1\right)}{4^2\left(4^{14}+1\right)}=\dfrac{4^3}{4^2}=4\)
\(\dfrac{4^{17}+4^3}{4^{16}+4^2}=\dfrac{4^3\left(4^{14}+1\right)}{4^2\left(4^{14}+1\right)}=4\)
B=(4+4^2+4^3)+....+(4^15+4^16+4^17)
=4.(4^0+4^1+4^2)+....+4^15.(4^0+4^1+4^2)
=4.(1+4+16)+....+4^15.(1+4+16)
=4.21+...+4^15.21
21.(4+...+4^15) chia hết cho 17
Do B : 17
=> B : 17 dư 0.
sao 21.(4+...+4^15) lại chia hết cho 17
bạn giải thik kĩ đc ko
B=(4+4^2+4^3)+....+(4^15+4^16+4^17)
=4.(4^0+4^1+4^2)+....+4^15.(4^0+4^1+4^2)
=4.(1+4+16)+....+4^15.(1+4+16)
=4.21+...+4^15.21
21.(4+...+4^15) chia hết cho 17
vậy B chia hết cho 17
(\(5^{16}\)+\(16^5\))(\(3^{17}\) -\(3^{10}\))(\(2^4\) -\(4^2\) )
=(\(5^{16}\) +\(16^5\))(\(3^{17}\) -\(3^{10}\))(16-16)
=(\(5^{16}\)+\(16^5\) )(\(3^{17}\) - \(3^{10}\)) .0
=0
Xét \(B=4+4^2+4^3+...+4^{17}\)
\(B=4+\left(4^2+4^3+4^4+4^5\right)+\left(4^6+4^7+4^8+4^9\right)+...+\left(4^{14}+4^{15}+4^{16}+4^{17}\right)\)
\(B=4+4^2\left(1+4+4^2+4^3\right)+4^6\left(1+4+4^2+4^3\right)+...+4^{14}\left(1+4+4^2+4^3\right)\)
\(B=4+4^2\cdot85+4^6\cdot85+...+4^{14}\cdot85\)
\(B=4+85\left(4^2+4^6+...+4^{14}\right)\)
\(B=4+17\cdot5\left(4^2+4^6+...+4^{14}\right)\)
Mà \(17\cdot5\left(4^2+4^6+...+4^{14}\right)⋮17\)
\(\Rightarrow4+17\cdot5\left(4^2+4^6+...+4^{14}\right)\)chia 17 dư 4
Hay \(B\)chia 17 dư 4 (ĐPCM)
\(B=4+4^2+4^3+4^4+........+4^{17}\)
\(B=4+\left(4^2+4^4\right)+\left(4^3+4^5\right)+...+\left(4^{15}+4^{17}\right)\)
\(B=4+4^2\left(1+4^2\right)+.....+4^{15}\left(1+4^2\right)\)
\(B=4+4^2.17+....+4^{15}.17\)
\(B=4+17.\left(4^2+4^3+...+4^{15}\right)\)
\(\Rightarrow\)\(17.\left(4^2+4^3+...+4^{15}\right)\)\(⋮17\)
\(\Rightarrow B:17\)\(dư\)\(4\)
\(\text{Vậy B chia 17 dư 4}\)
1: \(=-145\cdot13+145\cdot57+57\cdot10-57\cdot145=-1315\)
2: \(=17\cdot15-17\cdot16+16\cdot17-16\cdot20=255-320=-65\)
3: \(=-38\cdot25+38\cdot4-25\cdot4+25\cdot38=13\cdot4=52\)
4: \(=23\cdot145-23\cdot17-145\cdot23+145\cdot6=479\)
5: \(=24\cdot15-24\cdot4+4\cdot24-4\cdot15=360-60=300\)
6: \(=199\left(15-17+17-5\right)=199\cdot10=1990\)
7: \(=-39\cdot5+39\cdot99+99\cdot10-99\cdot39=795\)
( 417 + 43 ) : ( 416 + 42 )
= [ 43 . ( 414 + 1 ) ] : [ 42 . ( 414 + 1 )]
\(=\frac{4^3.\left(4^{14}+1\right)}{4^2.\left(4^{14}+1\right)}=\frac{4^3}{4^2}=4\)