设复数z满足z(3+4i)=7+i(i为虚数单位),则|z|=______

设复数z满足z(3+4i)=7+i(i为虚数单位),则|z|=______.
2025-04-05 19:17:13
推荐回答(1个)
回答1:

∵z(3+4i)=7+i,
∴z=

7+i
3+4i
=
(7+i)(3?4i)
(3+4i)(3?4i)

=
25?25i
25
=1-i
∴|z|=
12+(?1)2
=
2

故答案为:
2