Đặt A=1/2+1/4+1/6+1/8+1/16+...+1/256+1/512
=(1/2+1/4+1/8+1/16+...+1/256+1/256-1/512)+1/6
=(1-1/2+1/2-1/4+1/4-1/8+1/8-1/16+...+1/128-1/256+1/256-1/512)+1/6
=1-1/512+1/6
=1789/1536
Vậy A=1789/1536
tinh nhah
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512+1/1024 ket qua bang bao nhieu
tinh bang cach thuan tien nhat
1/2+1/6+1/12+1/20
1/2+1/6+1/12+1/20+.........+19900
1/2+1/3+1/4+1/8+1/16
1/2+1/3+1/4+1/8+1/16+.......+1/512
Tính nhanh:
1+2+4+8+...+256+512
tính nhanh
1+2+4+8+....+256+512
1+2+4+8+...+256+512
Giải giúp mik vs
A=1/2+1/4+1/8+1/16+.........+1/512+1/1024 = ?
Tính tổng:1 + 1/2 + 1/4 + 1/8 + 1/16 + ...+ 1/512 + 1/1024
Tính bằng các hợp lí
1/2+1/4+1/8+1/16+....+1/265+1/512
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
