将十进制小数转换为二进制数一般采用（）。
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解: (1)(0.100)2 =1x21+0x22 +0x2- +1x2+ =0.5625
(2)011)2 =0x2-+1x22+1x2* +1x2*=0.4375
(3)(0.101101)2=1x2++0x22 +1x2*+1x2+ +0x2*+1x2*=0.703125
(4)(0011)26=0x2+ +0x2-+1x2-3 +1x2*+1x2*+1x29=0.234375