分解因式：x（x-4）+4=______．
原式=x2-4x+4=（x-2）2．
故答案为：（x-2）2．
Mrs. Black doesn't know if her American friend _____ to Heilongjiang. If he _____ here, she will meet
him at the airport.[ ]
A. will come; comes
B. will come; will come
C. comes; will come
D. comes; comes
板块节目
