Zhang Ling is my good friend. She is in Class 1, Grade 4.We are in the same class. She is a model student. She is very clever and she is always ready to helps others. She is good at English. Her favourite colour is red. She has a lot of
The difficulty which we had ______ with the local people has been removed.
多项式6ab2c﹣3a2bc+12a2b2的公因式是( )
已知分式x-2x+3的值为0,则x的值为( )