1+5+1+5+5+1+5+5+5+...+1+5+5+5+5+...+5+1 có 2018 Cs 5
A=2 mũ 3 + 2 mũ 4 + 2 mũ 5 + 2 mũ 6 + 2 mũ 7 +.....+ 2 mũ 90
B=1+5+5 mũ 2 + 5 mũ 3 +5 mũ 4 +......+5 mũ 50
C=1/5 +1/5 mũ 2 + 1/5 mũ 3 + 1/5 mũ 4 +1/5 mũ 6 +......+1/5 mũ 102
D=1/5 +1/5 mũ 3 + 1/5 mũ 4 +1/5 mũ 5 + 1/5 mũ 6 +1/5 mũ 105
1/5+1/5^2+1/5^3+1/5^4+1/5^5+......+1/5^2012<1/4
g=1/5-1/5^2+1/5^3-1/5^4+.................+1/5^90-1/5^91
g=1/5-1/5^2+1/5^3-1/5^4+...............+1/5^90-1/5^91
cho M = 1/3 + 1/5 + 1/9 + 1/17 + 1/33 + 1/65 va N = 1/5^2 - 2/5^3 + 3/5^4 - 4/5^5 + . . . + 99/5^100 - 100/5^101
Tính: A= 4.\(5^{100}\)(\(\dfrac{1}{5}\)+\(\dfrac{1}{5^2}\)+\(\dfrac{1}{5^3}\)+...+\(\dfrac{1}{5^{99}}\)+\(\dfrac{1}{5^{100}}\))+1
Câu 24: Tìm tập các ước nguyên của 5
A.Ư(5) = {1; 5} B.Ư(5) = {-1; -5}
C.Ư(5) = {0; 5; 10; …} D.Ư(5) = {1; -1; 5; -5}
1+1/5+(1/5)2+(1/5)3+(1/5)4+...+(1/5)99+(1/5)100
a,1/3 .(x-2/5)=3/4 b, 7/3:(x-2/3)=4/5 c,1/3.(x-2/5)=4/5 d, 2/3.(x-1/2)-1/4.(x-2/5)=7/3 e,3/7 .(x-2/3)+1/2=5/4.(x-2) f,1/2.(x-3)+1/3.(x-4)+1/4.(x-5)=1/5 g,[2/3.(x-1/2)-4/5]:(x-1/3)=21/5 h, {x-[1/2.(x-3)+11/5]}:(x-1/2)=3/5 i,x.(x-2/5)-(x+2).x+11/4=4/3