C1:Dùng máy tính
C2:Đặt A=tổng
=>2A=4+8+16+...+2048
=>2A-A=2048-2=2046
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Các câu hỏi tương tự
a) 2+4+8+16+32+64+128+256+512+1024+2048
b) \(\frac{\left(2+4+6+8+...+1000\right)nhan10}{2+4+8+16+...+512-2}\)
1+ 1/2 + 1/4 + 1/8 + 1/16+ 1/32 +1/64 + .... + 1/512 +1/1024
Tính nhanh tổng a,1+4+9+16+25+....+144+169. b,1+2+4+8+16+32+........+256+512+1024
tính nhanh \(\dfrac{1}{2}\) +\(\dfrac{1}{4}\) +\(\dfrac{1}{8}\)+\(\dfrac{1}{16}\) +.....+\(\dfrac{1}{512}\) +\(\dfrac{1}{1024}\)
Tính nhanh:
1+2+4+8+16+32+.......+256+512+1024
b,1+4+9+16+25+........+144+169
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512+/1024
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512+1/1024 =?
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512+1/1024
A=1/2+1/4+1/8 + 1/16+1/32+1/64+1/128+1/256+1/512+1/1024 = ?