請教奧數題目

BB-CLEVER

In atest of 10 questions, 10 marks for each correct answer and 5 marks will bededucted for each wrong answer. Suppose John gets x answers correct and yanswers wrong. Express the total marks, T, in terms of x and y.

thank you for your help.

kerkermui

T=10x-5y
但咁樣會唔會簡單咗d？

dubbies

就係咁簡單 有負數概念 -5分 x 錯的題數，正數就係+10 x 錯的題數 等於總分。 如果佢唔設 x  y，條數會好玩d