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
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