a1[]==  7.71,  8.72, 10.25, 22.98, 19.55 
a1ĺ==69.21358
a1ƽֵ==13.842715
a1ֵ==22.976913
a1Сֵ==7.7127547
a1һb1==  0.00,  0.07,  0.17,  1.00,  0.78 
c2==a+bi=10.0+20.0i
c3==a+bi=1.0+2.0i
c1(=c2+c3)==a+bi=11.0+22.0i
c1(=c2-c3)==a+bi=9.0+18.0i
c1(=c2*c3)==a+bi=-30.0+40.0i
c1(=c2/c3)==a+bi=10.0+0.0i
