SelectCaseiCase"+"a1=a1+b1a2=a2+b2Case"-"a1=a1-b1a2=a2-b2Case"*"t=a1a1=a1*b1-a2*b2a2=t*b2+a2*b1t=a1Case"/"Ifb10Orb20Thent=a1a1=(a1*b1+a2*b2)/(b1*b1+b2*b2)a2=(b1*a2-