15. 若 m n, 為正整數，方程式x4+5x3+mx2+nx+4=0的四根中，有兩相異實根和為−5 ，則此方程式的最小可能實根為＿＿＿。

3. The following text was written by a Chinese learner of English. Identify, describe the errors and indicate the sources of the errors. How will you deal with the errors? When I was a little boy, I must go to school to learn the knowledge. I must study hard day by day. I have took many test. I always fell that I have no time to do the things I like to do. They homework make my life free from happiness. My life is full of ancidite. I always study for the examination. If the government don’t take a method to solve this question, the youth will be lack in the power of creates their future.

15. 若 m n, 為正整數，方程式x4+5x³+mx²+nx+4=0的四根中，有兩相異實根和為−5 ，則此方程式的最小可能實根為＿＿＿。

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