题目内容
已知i是虚数单位，若
=b+i(a，b∈R)，则ab的值为______．
| a+3i |
| i |
由
=b+i，得
=
=3-ai=b+i．
所以b=3，a=-1．
则ab=（-1）×3=-3．
故答案为-3．
| a+3i |
| i |
| a+3i |
| i |
| -i(a+3i) |
| -i2 |
所以b=3，a=-1．
则ab=（-1）×3=-3．
故答案为-3．
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题目内容
| a+3i |
| i |
| a+3i |
| i |
| a+3i |
| i |
| -i(a+3i) |
| -i2 |