(1-2i)*(2+1i)*(3-4i)=?(1-2i)*(2+i)*(3-4i)=?
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(1-2i)*(2+1i)*(3-4i)=?
(1-2i)*(2+i)*(3-4i)=?
=(2+i-4i+2)(3-4i)
=(4-3i)(3-4i)
=12-16i-9i-12
=-25i
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