[填空题]
Three vectors are shown in Fig. below. ;*(2h wvk 7erott +xwp+fg 7040 hulcutc g/yuTheir magnitudes are given in arbitraryzem f wq4 /iqfys+/ t+r3g6tc5 units. Determine the sum of the ttecf/63w5 s+/zf+y qr iqg t4mhree vectors. Give the resultant in terms of (a) components, (b) magnitude and angle with the x axis.