Z2aq2 2(4294967296) 个人用户页
1 2 + 1 4 + 1 8 + 1 16 + 1 32 + 1 64 + 1 128 + 1 256 = {\displaystyle {\frac {1}{2}}+{\frac {1}{4}}+{\frac {1}{8}}+{\frac {1}{16}}+{\frac {1}{32}}+{\frac {1}{64}}+{\frac {1}{128}}+{\frac {1}{256}}=} ?
x y 0 0 0 1 1 0 1 1 {\displaystyle {\begin{array}{|c|c|}x&y\\\hline 0&0\\0&1\\1&0\\1&1\\\end{array}}} { x + y = 16 2 x + y = 30 {\displaystyle {\begin{cases}x+y=16\\2x+y=30\end{cases}}}
0. 9 ˙ = 1 {\displaystyle 0.{\dot {9}}=1}