#)Giải :
\(\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}\)
\(=\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+\frac{1}{8}-\frac{1}{16}+\frac{1}{16}-\frac{1}{32}+\frac{1}{32}-\frac{1}{64}+\frac{1}{64}-\frac{1}{128}\)
\(=\frac{1}{2}-\frac{1}{128}\)
\(=\frac{63}{128}\)
1. tinh nhanh: 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128
2. tim x: ( x + 1/2 ) + ( x +1/4 ) + ( x + 1/8 ) + ( x + 1/16 ) = 1
X*[1/2+1/4+1/8+1/16+1/32+1/64+1/128]=127/128
tinh nhanh
H = 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256
Thằng nào làm được mỗi ngày tớ cho 1 tích
1/4+1/8+1/16+1/32+1/64+1/128
1/4+1/8+1/16+1/32+1/64+1/128.
tinh nhanh tong sau 1 phan 2 cong 1 phan 4 cong 1 phan 8 cong 1 phan 10 cong 1 phan 16 cong 1 phan 32 cong 1 phan 64 cong 1 phan 128
tính nhanh p/s 1+ 5/4 + 5/8 + 5/16 + 5/32 + 5/64
b) 1/3 +1/9 + 1/27 + 1/81 +...........+ 1/59049
c) 3/2 + 3/8 + 3/32 +3/128 + 3/512
d) 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256 giúp mình với 
C = 1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128
tinh tong banh cach nhanh nhat
A= 1/2 +1/4+1/8+1/16+1/32+1/64+1/128+1/256
GIAI CHI TIET GIUM NHE
