\(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+\frac{1}{8}-\frac{1}{16}+\frac{1}{16}-\frac{1}{32}\)
\(=1-\frac{1}{32}=\frac{31}{32}\)
1*2*4+2*4*8+4*8*16+8*16*32/1*3*4+2*6*8+4*12*16+8*24*32
Tính
chứng minh 1/2 - 1/4 + 1/8 - 1/16 + 1/32 - 1/64 < 1/3
Chứng minh 1/2 + 1/4 + 1/8 + 1/16+ 1/32 + 1/64 < 1/3
Chứng minh: ( 2x + 3y ) Chia hết cho 17 ki và chỉ khi ( 9x + 5y) chia hết cho 17
1/2 + 1/4 + 1/8 + 1/16 + 1/32
1/2 + 1/4 + 1/8 + 1/16 + 1/32
{ 1/2 + 1/4 + 1/8 + 1/16 } : x = 1/2 + 1/6 + 1/8 + 1/12 + ....+ 1/32
1/2 + 1/4 + 1/8 +1/16 + 1/32 + 1/64 +1/128
1/2+1/4+1/8+1/16+1/32+...+1/2048+1/4096
1/2+1/4+1/8+1/16+1/32+1/64+1/128
chứng minh 1/2-1/4+1/8-1/16+1/32-1/64<1/3
