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a) 49.(-34)+(-65).49-49 = 49. (-34-65-1)= 49. (-100)= -4900
b) -268-(-47-168)-147 = (-268 + 168) - (147 - 47)= -100 -100=-200
c) (-2)2.(-3)-[(-1)2024+8]:(-3)2 = 4. (-3) - [1 +8]:9 = -12 - 9:9 = -12 - 1 = -13
d) 67-[8+7.32 -24:6+(9-7)3]:15 = 67 - [8 + 7.9 - 4 + 23 ] : 15
= 67 - [8+63-4+8]:15 = 67 - 75:15 = 67 - 5 = 62
1. Nhóm 3 số thành 1 cặp thì sẽ chia hết cho 4
VD : 2+2^2+2^3 = 14 chia hết cho 14
2. Từ số thứ 3 thì nhóm 4 số thành 1 cặp
VD : 3^4+3^5+3^6+3^7 = 3^4.(1+3+3^2+3^3) = 3^4.40 chia hết cho 40
Còn lại 2 số đầu = 3^2+3^3 = 36 chia 40 dư 36
=> D chia 40 dư 36
k mk nha
a/ A= (3+5)2 = 82 = 64
B = 32 + 52 = 9 + 25 = 34
vì 64>34 => A > B
b/ C = (3+5)3 = 83 = 512
D = 33 + 53 = 27 + 125 = 152
Vì 512>152 => C > D
3 ^ 2 + 5 ^ 2 = (3 x 3 ) + (5 x 5) = 9 + 25 = 34
3 ^ 3 + 5 ^ 3 = (3 x 3 x 3) + ( 5 x 5 x5 ) = 27 + 125 = 152
152 > 34 hoac 3^3 + 5^3 ban thay 3^3 > 3 ^2 vi 3 ^3 = 3 x 3x 3 con 5 ^ 3 > 5 ^ = 5 ^ 3 = 5 x 5 x 5 , 5^2
5 x 5
a: \(A=25+125=150\)
b: \(B=16+64=80\)
c: \(C=32+9+1=33+9=42\)
d: \(D=1+8+27=35+1=36\)
g: \(K=11\cdot3^{29}-\dfrac{3^{30}}{4\cdot3^{28}}=11\cdot3^{29}-\dfrac{9}{4}\)
bài 1
a) ( 864 . 48 - 432 . 96 ) : 864 . 432 b) ( 7256 . 4375 - 725 ) : ( 3650 + 4375 . 7255 )
=( 41 472-41 472) :864 . 432 = ( 31745000 - 725 ) : ( 3650 + 31740625 )
= ( 0: 864 ) . 432 = 31744275 : 31744275
=0.432=0 =1
bài 2 mik lm sau giúp bn nhé
bài 1
a) ( 864 . 48 - 432 . 96 ) : 864 . 432 b) ( 7256 . 4375 - 725 ) : ( 3650 + 4375 . 7255 )
=( 41 472-41 472) :864 . 432 = ( 31745000 - 725 ) : ( 3650 + 31740625 )
= ( 0: 864 ) . 432 = 31744275 : 31744275
=0.432=0 =1
bài 2 tự làm
1) 3B - B = (32 + 33 + 34 + ... + 3101) - (3 + 32 + 33 + ... + 3100)
2B = 3101 - 3 => 2B + 3 = 3101 => n = 101
2) 52.C - C = (53 + 55 + 57 + 59 + ... + 5103) - (5 + 53 + 55 + 57 + ... + 5101)
24C = 5103 - 5
C =\(\frac{5^{103}-5}{24}\).Tương tự,\(D=\frac{13^{101}-13}{168}\Rightarrow C+D=\frac{5^{103}-5}{24}+\frac{13^{101}-13}{168}=\frac{7.\left(5^{103}-5\right)+\left(13^{101}-13\right)}{168}=\frac{7.5^{103}+13^{101}-48}{168}\)
a) \(A=2+2^2+2^3+....+2^{100}\)
\(2A=2^2+2^3+2^4+....+2^{101}\)
\(2A-A=\left(2^2+2^3+2^4+....+2^{101}\right)-\left(2+2^2+....+2^{100}\right)\)
\(A=2^{101}-2\)
B) \(B=1+3+3^2+3^3+...+3^{2009}\)
\(3B=3+3^2+3^3+3^4+...+3^{2010}\)
\(3B-B=\left(3+3^2+3^3+3^4+...+3^{2010}\right)-\left(1+3+3^2+...+3^{2009}\right)\)
\(2B=3^{2010}-1\)
\(B=\frac{3^{2010}-1}{2}\)
C) \(C=1+5+5^2+....+5^{1998}\)
\(5C=5+5^2+5^3+...+5^{1999}\)
\(5C-C=\left(5+5^2+5^3+...+5^{1999}\right)-\left(1+5+5^2+...+5^{1998}\right)\)
\(4C=5^{1999}-1\)
\(C=\frac{5^{1999}-1}{4}\)
D) \(D=4+4^2+4^3+...+4^n\)
\(4D=4^2+4^3+4^4+...+4^{n+1}\)
\(4D-D=\left(4^2+4^3+4^4+...+4^{n+1}\right)-\left(4+4^2+4^3+...+4^n\right)\)
\(3D=-4\)
\(D=\frac{-4}{3}\)
Ý D mk ko bít đúng ko
hok tốt k mk nhé
\(A=2+2^2+2^3+...+2^{100}\)
\(2A=2^2+2^3+...+2^{101}\)
\(2A-A=\left(2^2+2^3+...+2^{101}\right)-\left(2+2^2+...+2^{100}\right)\)
\(A=2^{101}-2\)'
\(B=1+3+3^2+3^3+...+3^{2009}\)
\(3B=3+3^2+3^3+...+3^{2010}\)
\(3B-B=3^{2010}-1\)
\(2B=3^{2010}-1\)
\(B=\frac{3^{2010}-1}{2}\)
\(C=1+5+5^2+5^3...+5^{1998}\)
\(5C=5+5^2+...+5^{1999}\)
\(5C-C=5^{1999}-1\)
\(4A=5^{1999}-1\)
\(A=\frac{5^{1999}-1}{4}\)
\(D=4+4^2+4^3+...+4^n\)
\(4D=4^2+4^3+...+4^{n+1}\)
\(4D-D=4^{n+1}-4\)
\(3D=4^{n+1}-4\)
\(D=\frac{4^{n+1}-4}{3}\)
\(C=\dfrac{2}{3}+\left(\dfrac{2}{3}\right)^2+...+\left(\dfrac{2}{3}\right)^{2024}\)
=>\(\dfrac{2}{3}C=\left(\dfrac{2}{3}\right)^2+\left(\dfrac{2}{3}\right)^3+...+\left(\dfrac{2}{3}\right)^{2025}\)
=>\(\dfrac{2}{3}C-C=\left(\dfrac{2}{3}\right)^2+\left(\dfrac{2}{3}\right)^3+...+\left(\dfrac{2}{3}\right)^{2025}-\dfrac{2}{3}-\left(\dfrac{2}{3}\right)^2-...-\left(\dfrac{2}{3}\right)^{2024}\)
=>\(-\dfrac{1}{3}\cdot C=\left(\dfrac{2}{3}\right)^{2025}-\dfrac{2}{3}\)
=>\(C\cdot\dfrac{1}{3}=\dfrac{2}{3}-\left(\dfrac{2}{3}\right)^{2025}=\dfrac{2}{3}-\dfrac{2^{2025}}{3^{2025}}=\dfrac{2\cdot3^{2024}-2^{2025}}{3^{2025}}\)
=>\(C=\dfrac{2\cdot3^{2024}-2^{2025}}{3^{2024}}\)
\(C+D=\dfrac{2\cdot3^{2024}-2^{2025}+3\cdot2^{2024}}{3^{2024}}\)