A.0.678 B.0.878 C.0.714 D.0.752
A.加減運算中,有效數(shù)字以小數(shù)點位數(shù)最少為準 B.乘除計算中,有效數(shù)字以最少有效數(shù)字位數(shù)為準 C.常數(shù)π的有效數(shù)字位數(shù)需要幾位取幾位 D.將常數(shù)開方后,結(jié)果必須比原數(shù)少一位
A.1m B.10m C.0.1m D.0.5m