下列数字修约到0.5单位,正确的一组是( )。A:24.38→24.5,40.7

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问题 下列数字修约到0.5单位,正确的一组是( )。A:24.38→24.5,40.75→41.0B:36.16→36.5,52.45→52.5C:24.38→24.0,40.75→40.5D:36.16→36.5,52.45→52.0

选项 A:24.38→24.5,40.75→41.0
B:36.16→36.5,52.45→52.5
C:24.38→24.0,40.75→40.5
D:36.16→36.5,52.45→52.0

答案 A

解析 0.5单位修约(半个单位修约)将修约数字乘以2,按指定修约间隔对2X依2的规定修约,所得数值(2X修约值)再除以2;如24.38→24.38*2=48.76→49→24.5。
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