9 若 z1=1- i, z2=-2+4i, z3= ，求 1021760-1-5eb85b57069e0.png#s-27,37 之虛部值為？
(A)1021760-2-5eb85b5861b2c.png#s-65,36
(B)1021760-3-5eb85b59e5ba6.png#s-40,40 
(C)4/7
(D)1021760-4-5eb85b5b83998.png#s-43,34

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統計： A(6), B(0), C(0), D(0), E(0) #1021760