`A=3 + 3/5 + 3/25 + 3/125 + 3/625`
`5A=5 xx (3+3/5+3/25+3/125+3/625)`
`5A= 15+3+3/5+3/25+3/125`
`5xxA-A=(15+3+3/5+3/25+3/125)-(3+3/5+3/25+3/125+3/625)`
`(5-1)xxA=15+3+3/5+3/25+3/125-3-3/5-3/25-3/125-3/625`
`4 xx A=(15-3/625)+(3-3)+(3/5-3/5)+(3/125-3/125)`
`4 xx A=9372/625+0+0+0+0`
`A=2343/625`
Giúp tớ với!
Tính nhanh:3+3/5+3/25+3/125+3/625
Tính giá trị biểu thức :
A = 3+ 3/5+ 3/25+ 3/125+ 3/625
Tính nhanh
D = 3/2 + 3/8 + 3/32 + 3/128 + 3/512
E = 3 +3/5 + 3/25 + 3/125 + 3/625
G = 1/5 + 1/10 + 1/20 + 1/30 +....+ 1/1280
3+3/5+3/25+3/125+3/625
T-nh nhanh : (Dấu - là chữ y ngắn)
\(3+\frac{3}{5}+\frac{3}{25}+\frac{3}{125}+\frac{3}{625}\)
3+3/5+3/25+3/125+3/625
3+3/5+3/25+3/125+3/625
a}A= 3/5+3/25+3/125+3/625
Tính nhanh :
A = 3/1x5 + 3/5x9 + 3/9x3 + ...... 3/97x101 + 3/101x105
B = 1/5 + 1/25 + 1/125 + 1/625 + 1/3125 + 1/15625
C = 1 + 2 + 4 + 8 + 16 +... + 2048 + 4096
Soyeon_ Tiểu bàng giải giúp mình nhé
\(3+\frac{3}{5}+\frac{3}{25}+\frac{3}{125}+\frac{3}{625}\)
