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已知z1=5+10¡,z2=3-4¡,1/z=1/z1+1/z2,求z.
题目详情
已知z1=5+10¡,z2=3-4¡,1/z=1/z1+1/z2,求z.
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答案和解析
1/Z=1/Z1+1/Z2=(Z1+Z2)/Z1Z2
Z=Z1*Z2/(Z1+Z2)
∵ Z1*Z2=(5+10i)(3-4i)=55+10i
Z1+Z2=(5+10i)+(3-4i)=8+6i
∴ Z=Z1*Z2/(Z1+Z2)
=(55+10i)/(8+6i)
=(55+10i)*(8-6i)/[(8+6i)(8-6i)]
=(55+10i)*(8-6i)/100
=(11+2i)(4-3i)/10
=(50-25i)/10
=5-(5/2)i
快点抄,别耽误了考试
Z=Z1*Z2/(Z1+Z2)
∵ Z1*Z2=(5+10i)(3-4i)=55+10i
Z1+Z2=(5+10i)+(3-4i)=8+6i
∴ Z=Z1*Z2/(Z1+Z2)
=(55+10i)/(8+6i)
=(55+10i)*(8-6i)/[(8+6i)(8-6i)]
=(55+10i)*(8-6i)/100
=(11+2i)(4-3i)/10
=(50-25i)/10
=5-(5/2)i
快点抄,别耽误了考试
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