Đặt A=1/2+1/2+1/8+1/16+.....+1/256+1/512
2A=1+1/2+1/4+1/8+.....+1/128+1/256
2A-A=1-1/512
A=511/512
Đặt A=1/2+1/4+1/8+1/16+.....+1/256+1/512
A2A=1+1/2+1/4+1/8+....+1/256
2A-A=1-1/512
A=511/512
tính nhanh
1/2+1/4+1/8+1/16+.......+1/256+1/512
Tính nhanh : 1+1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512
Tính nhanh tổng A biết :A =1/2+1/4+1/8+1/16+....+1/256+1/512
Tính nhanh
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
Tính nhanh:
1/2 + 1/4 + 1/8 + 1/16 + 1/32 + 1/64 + 1/128 + 1/256
Ghi lời giải đầy đủ nhé cảm ơn ạ
Tính nhanh :
a, A= 1 + 4 + 16 + 64 + .........+ 16384 + 65536
b, B= 1/2 + 1/4 + 1/8 + 1/16 + ..........+ 1/128 + 1/256
c, C= 4/1x5 + 4/5x9 + 4/8x13 +...........+ 4/81/85 + 4/81x89
d, D= 1/1x4 + 1/4x7 + 1/7x10 + ..........+ 1/301x304 + 1/304x307
e, E= 1/2 + 1/6 + 1/12 + 1/20 + 1/30 +........+ 1/110 + 1/132
g, G= 2/1x6 + 2/6x11 + 2/11x16 + 2/16x21+........+ 2/91x96 + 2/96x101
1 . Tính nhanh
1/2 + 1/4 + 1/8 + 1 /16 + 1/32 + 1/64 +............+ 1/192 + 1/256
tính nhanh :1/2 + 1/4 + 1/8 + 1/16 +1/32 + 1/64 + 1/128 + 1/256
giúp mình nha ^_^
\(\dfrac{1}{2}\)+\(\dfrac{1}{4}\)+\(\dfrac{1}{8}\)+\(\dfrac{1}{16}\)+\(\dfrac{1}{32}\)+\(\dfrac{1}{64}\)+\(\dfrac{1}{128}\)+\(\dfrac{1}{256}\)
Tính nhanh
