试题 试卷
题型:解答题 题类:常考题 难易度:普通
(1)a(x+y)=ax+ay
(2)x2+2xy+y﹣1=x(x+2y)+(y+1)(y﹣1)
(3)ax2﹣9a=a(x+3)(x﹣3)
(4)x2+2+=
(5)2a3=2a•a•a.
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