数字修约的规则$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
1、$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
修约间隔:指确定修约保留位数的一种方式,修约间隔一旦确定后,修约值即为该值的整倍数。$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
2、$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
数字修约的进舍规则$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
(1)拟舍弃数字最左一位数小于5时,则舍去,即4舍5入。$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
例如:13.2476(0.1)→13.2$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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13.2476(0.01)→13.25$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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13.2476(1)→13$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
(2)拟舍弃数字最左一位数≥5时,而且后面的数字并非全部为0时,则进1,(保留末位数加1)$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
例如:1167(100)→1200$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
12*102$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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1167(10)→1170$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
117*10$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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10.502(1)→11$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
(3)似舍弃数字最左一位数为5,而后面无数字或全部为0时,若所保留的末位数为奇数(1、3、5、7、9)则进一,为偶数(2、4、6、8、0)则舍弃,即奇进偶不进。$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
例如:2.050(0.1)→2.0$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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0.150(0.1)→0.2$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
1350(100)→1400$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
14*102$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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0.0345(保留2位有效)0.034$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
(4)负数修约同前$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
(5)0.5单位修约时,将拟修约数乘以2,按指定数位依进舍规则修约,所得数值再除以2。$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
A$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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2A$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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24(1)$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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A的修约值$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
50.25$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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100.5$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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100$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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50.0(0.5)$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
50.38$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
100.76$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
101$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
50.5$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
(6)0.2单位修约时,先乘5,再除以5。同上。方法:小数间隔,先乘后除。$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
例如:将下列数修约到百位数0.2个单位(修约间隔20)$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
A$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
5A$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
5A的修约值(100) $9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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A的修约值(20)$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
830$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
4150$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
4200$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
840$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
842$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
4210$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
4200$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
840$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
又例:将下列数修约到个位数的5个单位。方法:整数间隔,先除后乘(钢筋就是这样修约)$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
A$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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A/5$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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A/5(1)$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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A(5)$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
442.5$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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88.5$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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88$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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440$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
442.52$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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88.504$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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89$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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445$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
541.9$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
108.38$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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108$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
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540$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
243.5$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
48.72$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
49$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
245$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
347.5$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
69.50$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
70$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®
350$9^qa,Ñ9Þbbs.3c3t.comÂ'µRʱ4M®