若3-4i/1+3i=(x/2)+2yi,求x及y的值?
回答 (3)
Sol
無條件x,y為實數解答有無限多組
加上x,y為實數
(3-4i)/(1+3i)
=(3-4i)(1-3i)/[(1+3i)(1-3i)]
=(3-9i-4i-12)/(1+9)
=(-9-13i)/10
-9/10=x/2
x==-9/5
-13/10=2y
y=-13/20
(3-4i)/(1+3i)=(x/2)+2yi
(-9/10)-(13/10)i=(x/2)+2yi
-9/10=x/2
x=-9/5
-13/10=2y
y=-13/20
先有理化,可得(-9-13i)/10
故x==-9/5
y=-13/20
收錄日期: 2021-04-18 15:29:41
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