9.27

package com;
import java.util.Random;

public class test {
    public static void main(String[] args) {
        short m=0,n=0,ov=0;
        char o='+';
        Random random=new Random();
        for (int i=0;i<50;i++){
            ov =(short) random.nextInt(2);
            m =(short) random.nextInt(101);
            n=(short) random.nextInt(101);
            if (ov == 1) {
                o='+';
            }else {
                o='-';
            }
            System.out.println(""+(i+1)+":\t"+m+o+n+"=");
        }
    };

}
自动生成50道口算题