0.28x60=16.8
0.8x60=48
2.28°=2 °16 ′48 ″

36÷60=0.6
（24+0.6）÷60=0.41

39°24′36″= 39.41°


43°18 ′54 ″ +27°29 ′25″
=70 °47 ′79 ″
=70 °48 ′19 ″