(1+2i)(x+yi)=4+3i (x-2y)+(y+2x)i=4+3i
问题描述:
(1+2i)(x+yi)=4+3i (x-2y)+(y+2x)i=4+3i
答
(1+2i)(x+yi)=4+3i
x+yi+2xi-2y=4+3i
(x-2y)+(y+2x)i=4+3i
所以x-2y=4 (实部相等)
y+2x=3(虚部相等)
解得:x=2,y=-1