소수점이하=2^-1*a+2^-2*b+2^-3*c+...(x^-y는x의음수y제곱)abc..를나열,방법)0.4=>0.0110...->0.4x2=0.8(a=0),0.8x2=1.6(b=1),0.6x2=1.2(c=1),0.2x2=0.4(d=0)...
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