文件名称:Fourth
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利用随机函数产生5道两位数的加法题，每答对一道得20分，答错不得分，最后判断用户的总得分并输出。
提示：产生两位随机数用以下办法
int x=(int)(10+Math.random()*90)
-The random function of five double-digit addition problems, and for each correct answer a 20 points, got it wrong not scoring, the final judgment on the total score and the output of the user. Tip: Generate two random numbers using the following means int x = (int) (10+Math.random ()* 90)
提示：产生两位随机数用以下办法
int x=(int)(10+Math.random()*90)
-The random function of five double-digit addition problems, and for each correct answer a 20 points, got it wrong not scoring, the final judgment on the total score and the output of the user. Tip: Generate two random numbers using the following means int x = (int) (10+Math.random ()* 90)
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Fourth.java
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