Fatal error: Uncaught ValueError: bcmul(): Argument #2 ($num2) is not well-formed in /www/wwwroot/Jisuan5/WEB/index.php:81 Stack trace: #0 /www/wwwroot/Jisuan5/WEB/index.php(81): bcmul() #1 /www/wwwroot/Jisuan5/MOD/_ex.php(34): calRes() #2 /www/wwwroot/Jisuan5/WEB/index.php(65): include('...') #3 {main} thrown in /www/wwwroot/Jisuan5/WEB/index.php on line 81