将下列位值表中给出的数字写成十进制形式。
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待办事项
我们必须将位值表中给定的数字写成十进制形式。
解答
(a) $0\times100+0\times10+3\times1+2\times\frac{1}{10}+5\times\frac{1}{100}+0\times\frac{1}{1000}=0+0+3+\frac{2}{10}+\frac{5}{100}+0$
$=3+0.2+0.05$
$=3.25$
(b) $1\times100+0\times10+2\times1+6\times\frac{1}{10}+3\times\frac{1}{100}+0\times\frac{1}{1000}=100+0+2+\frac{6}{10}+\frac{3}{100}+0$
$=100+2+0.6+0.03$
$=102.63$
(c) $0\times100+3\times10+0\times1+0\times\frac{1}{10}+2\times\frac{1}{100}+5\times\frac{1}{1000}=0+30+0+0+\frac{2}{100}+\frac{5}{1000}$
$=30+0.02+0.005$
$=30.025$
(d) $2\times100+1\times10+1\times1+9\times\frac{1}{10}+0\times\frac{1}{100}+2\times\frac{1}{1000}=200+10+1+\frac{9}{10}+0+\frac{2}{1000}$
$=200+10+1+0.9+0.002$
$=211.902$
(e) $0\times100+1\times10+2\times1+2\times\frac{1}{10}+4\times\frac{1}{100}+1\times\frac{1}{1000}=0+10+2+\frac{2}{10}+\frac{4}{100}+\frac{1}{1000}$
$=0+10+2+0.2+0.04+0.001$
$=12.241$