∵a+bi=(1-2i)i=2+i(a,b∈R,i为虚数单位),
∴a=2,b=1.
∴ab=2.
故答案为:2.
若(1-2i)i=a+bi(a,b∈R,i为虚数单位),则ab=_.
若(1-2i)i=a+bi(a,b∈R,i为虚数单位),则ab=______.
数学人气:506 ℃时间:2020-05-30 01:52:45
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