3A=3.(1/3-1/3^2+1/3^3-...+1/3^99-1/3^100)
3A+A=(1-1/3+1/3^2+1/3^3-...+1/3^98-1/3^99)+(1/3-1/3^2+1/3^3-...+1/3^99-1/3^100)
4A= 1-1/3+1/3^2+1/3^3-...+1/3^98-1/3^99+1/3-1/3^2+1/3^3-...+1/3^99-1/3^100
4A=1-1/3^100
A=(1-1/3^100):4
chọn câu trả lời nha
Tính nhanh
A=1/3-1/3^2+1/3^3-1/3^4+.......+1/3^99-1/3^100
Tính nhanh
a) 1 + 2 + 3 + … + 99 + 100 b) 2 + 4 + 6 + … + 96 + 98
c) (–1) + 2 + (–3) + 4 + … + (–99) +100 d) –1 + 2 – 3 + 4 – … – 99 + 100
tính nhanh
cho A=1/3-1/3^2+1/3^3-1/3^4+...+1/3^99-1/3^100
TÍNH NHANH
1) S= 1/1*2+1/2*3+1/3*4+...+1/99*100
2) S= 3/1*3+3/3*5+2/5*7+...+2/97*99
3) S= 4/5*7+4/7*9+4/9*11+...+4/59*61
Tính nhanh
a, 1-2+3-4+.....+2015-2016+2017
b,1+3-5-7+9+11+....+97-98-99+100+101
c,1-2-3+4+5-6-7+....+97-98-99+100+101
d,2^100-2^99-2^98-....-2-1
Nhanh nha m dang cần gấp
Tính nhanh :
a,A= 1-2+ 3-4+ ....+ 99-100
B=1+3-5-7+9+11 - ....- 397-399
C= 1-2-3+4+5-6-7+8+...+ 97-98-99+100
ai nhanh mk sẽ tick
tính nhanh
e)A=1-2+3-4+...+99-100
g)B=1+3-5-7+9+11-...-397-399
h)C=1-2-3+4+5-6-7+..+97-98-99+100
i)D=2^100-2^99-2^98-..-2^2-2-1
1/tính nhanh
D=1^2+2^2+3^2+.......+1999^2
2/tính nhanh
a,A=1*3+2*4+3*5+....+99*101
b,B=1*4+2*5+3*6+4*7+.......+99*102
c,C=2^2+4^2+6^2+......+98^2+100^2
d,D=1*2^2+2*3^2+3*4^2+......+98.99^2
Tính nhanh
1/1*2+1/2*3+1/3*4+.....+1/99*100
