38,47,320,512,19,1225,1721,516
A:38 , 47 , 19, 1721
B:47 , 19 , 1721 , 516
C:38 , 47 , 1721 , 516
D:47 , 512 , 19 ,1721
下表是小华同学实验时记录的几组数据:
实验次数
物距u/cm
像距v/cm
1
30
15
2
20
3
4
5
/
5.6+2.8=____ 8.1-2.7=____ 1.5×0.6=____
4.08÷0.8=____ 1.75+3.8+0.25=____ 3.8+4.6+5.4=____
2.5×12=____ 1.25×16=____ 3.5+2.5×3=____
5.4-4.8÷1.2=____