đặt A=1/2 + 1/4 + 1/8 + 1/16 + 1/32
=>2A=1+1/2+1/4+1/8+1/16
=>2A-A=A=1-1/32=31/32
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đặt A=1/2 + 1/4 + 1/8 + 1/16 + 1/32
=>2A=1+1/2+1/4+1/8+1/16
=>2A-A=A=1-1/32=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 } : x = 1/2 + 1/6 + 1/8 + 1/12 + ....+ 1/32
B1: 1/2+1/4+1/8+1/16+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