(1) (1-i⒌)+(2-i⒎)+(3-i⒐)+(4-i⒒)
=1-i⒌+2-i7+3-i9+4-i⒒
=10-32i(实部虚部分别相加)
(2) (1-2i)(2+i)(3-4i)
=(2+i-4i+2)(3-4i)
=(4-3i)(3-4i)
=12-16i-9i-12
=-25i
i*i=-1
(1) (1-i⒌)+(2-i⒎)+(3-i⒐)+(4-i⒒)
=1-i⒌+2-i7+3-i9+4-i⒒
=10-32i(实部虚部分别相加)
(2) (1-2i)(2+i)(3-4i)
=(2+i-4i+2)(3-4i)
=(4-3i)(3-4i)
=12-16i-9i-12
=-25i
i*i=-1