a)1/2+1/6+1/12+........+1/9900+1/10100
b)1/2+1/4+1/8+....+1/256+1/512
a)1/2+1/6+1/12+.........+1/9900+1/10100 = ?
b)1/2+1/4+1/8+...........+1/256+1/512 = ?
Tính nhanh:
1/2+1/4+1/8+1/16+1/32+1/64+1/12+1/256+1/512.
nhanh lên mình đang vội
Tính tổng S = 1/2+1/4+1/8+.......+1/256+1/512
tính nhanh
1/2+1/4+1/8+1/16+.......+1/256+1/512
Kết quả của dãy tính:
1/2 + 1/4 + 1/8 + 1/16 + … 1/256 + 1/512 bằng…
Tính nhanh : 1+1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512
(1/2+1/4+1/8.....+1/256+1/512)*2=511/256
Tính nhanh tổng A biết :A =1/2+1/4+1/8+1/16+....+1/256+1/512