1 It seems that Susun does not like English very much.
2 3x²-12x=-12
3x²-12x+12=0
（ x-2）（3x-6）=0
所以 x-2=0 则 x =2
或
3x-6=0 则 x=2
所以 x =2

谢谢 还有三个~

1. students must keep quiet in school library.改为同义句

2. students can not eat in class改为同义句

    3. students are allowed to choose their own clothes by their teacher.改为主动语态

1 Students must not make noise in school library.2 Studeents are not allowed to eat in class.3 The teacher allow the students to choose their own clothes.