How to use computed or watch of vue for calculation

in vue, how to use computed to calculate
for example, unit price * (1 + tax rate) = price including tax
when I enter a unit price and tax rate, I can calculate the price including tax, and when I enter a price and tax rate, I can calculate the unit price without tax

depressed, tossing about, writing things always conflict
how to write
computed:

clipboard.png

watch:

clipboard.png

Mar.24,2021

computed
https://cn.vuejs.org/v2/api/-sharp.

watch
https://cn.vuejs.org/v2/api/-sharp.


put the changes to those two values in watch into computed. This is already an endless loop


trigger timing. Do not use the @ keyup and @ change events of the computed and watch
binding input boxes.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b37d5d-2c0cc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b37d5d-2c0cc.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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