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\(A=100+98+96+...+2-97-95-...-1\)
\(A=100+\left(98-98\right)+\left(96-95\right)+...+\left(2-1\right)\)
\(A=100+1+1+...+1\)
\(A=100+1\cdot49\)
\(A=100\cdot49\)
\(A=4900\)
\(B=1+2-3-4+5+6-7-8+9+10-11-12+...-299-300+301+302\)
\(B=1+\left(2-3-4+5\right)+\left(6-7-8+9\right)+...+\left(298-299-300+301\right)+302\)
\(B=1+0+0+...+302\)
\(B=1+302\)
\(B=303\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(A=\dfrac{16^5\cdot15^5}{2^{10}\cdot3^5\cdot5^4}=\dfrac{2^{20}\cdot3^5\cdot5^5}{2^{10}\cdot3^5\cdot5^4}=2^{10}\cdot5=5120\)
b: \(B=\dfrac{2^{15}\cdot3+2^{19}\cdot10}{2^{12}\cdot26}=\dfrac{2^{15}\left(3+2^4\cdot10\right)}{2^{13}\cdot13}=2^2\cdot\dfrac{163}{13}=\dfrac{652}{13}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
ủa sao ko một bóng ai giúp mik vậy , mik cầu xin mn đó , làm ơn giúp mik ik . Thật sự là mik đang cần rất gấp mà là cực kì gấp mà sao chẳng ai giúp mik , mong mn sẽ giúp mik . Cảm ơn mn nhìu
ủa sao ko ai giúp mik hết vậy . Mik đang cần gấp bài này mà
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a/ A= 1-3+5-7+9-11+......+97-99
= -2+(-2)+(-2)+......+(-2)
= (-2).25=-50
b/B=-1-2-3-4-...-100
=-(1+2+3+4+...+100)
=-5050
c/C=1-2+3-4+5-6+......+99-100
= -1+(-1)+(-1)+.............+(-1)
=(-1).50=-50
d/D=1-2-3+4+5-6-7+8+9-....+94-95
= (1-2-3+4)+(5-6-7+8)+.......+(92-93-94+95)
= 0+0+0+...+0=0
![](https://rs.olm.vn/images/avt/0.png?1311)
a) A = (-8) . 25 . (-2) .4 . (-5) .125
= [(-8). 125]. (25.4). [(-2 ).(-5)]
= -1000 . 100 . 10
= -1000000
b) B= 19.25 + 9.95 + 19.30
= 19.25 + 9.19.5+19.30
= 19.25 + 19.45+19.30
= 19.(25+45+30)
= 19. 100
= 1900
đúng 100% bn nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
S=5+5^2+5^3+5^4+...5^99
=> 5S=5^2+5^3+5^4+...5^100
=> 5S-S=4S=(5^2+5^3+5^4+...5^100)-(5+5^2+5^3+5^4+...5^99)
=> 4S = 5100-5
=> S=(5100-5)/4
S=5*5^2*5^3*5^4*...5^99
=> S=51+2+3+...+99
=> S=5((99+1).99):2
=> S=54950
(3x-2)+16=125+12
(3x-2)+16=137
3x-2=121
3x=123
x=41
5s=5^2+5^3+5^4+5^5+......+5^100
5s-s=5^100-5
4s=5^100-5
s=(5^100-5):4
kick nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(3x-2\right)^2+4^2=5^3+3.2^2\\ \Rightarrow\left(3x-2\right)^2+16=125+12\\ \Rightarrow\left(3x-2\right)^2=121\\ \Rightarrow3x-2=11\\ \Rightarrow x=\frac{13}{3}\)
S= \(5+5^2+5^3+.....+5^{99}\\ \Rightarrow5S=5^2+5^3+5^4+.....+5^{100}\\ \Rightarrow4S=5^{100}-5\\ \Rightarrow\frac{5^{100}-5}{4}\)
S=\(5.5^2.5^3.5^4.........5^{99}=5^{1+2+3+4+....+99}=5^{4950}\)
S=5+52+53+54+...+599
5S=52+53+54+...+599
5S-S=(52-52)+(53-53)+...+(599-599)+5100+5
S=(5100+5):4
2.(5+95).26-(9-4)
=2.100.26-5
=200.26-5
=5200-5=5195
\(2.\left(5+95\right).26-\left(9-4\right)\)
\(=2.100.26-5\)
\(=2.100.25\)
\(=50.100\)
\(=5000\)
Ps :nhớ k
# Aeri #