..HELP ME ...HELLO.I AM A STUDENT OF INTERNATIONAL SCHOOL.I CAN'T_英语解答

..HELP ME ...
HELLO.I AM A STUDENT OF INTERNATIONAL SCHOOL.I CAN'T UNDERSTAND.PLEASE HELP ME...THX..
1.已知 |1-4ki|=5,求实数k的值.
2.已知复数 z=|2-3i| + 3i ,求|z|

人气：139 ℃　时间：2020-07-18 06:47:05

解答

Now,let me help you,My english is too bad,Can you help me?haha(中文~!)first|1-4ki|=51^2+16k^2=2516k^2=24k^2=24/16k=(+ or -)2根号6/4secondz=|2-3i| + 3i =根号13+3iso |z|=根号（13+9）=根号22