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 則 x =2
或
3x-6=0 則 x=2
所以 x =2

謝謝 還有三個(gè)~

1. students must keep quiet in school library.改為同義句

2. students can not eat in class改為同義句

    3. students are allowed to choose their own clothes by their teacher.改為主動語態(tài)

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.