试题 试卷
题型:单选题 题类: 难易度:容易
广东省深圳市宝安区沙井中学2023-2024学年八年级(下)期中数学试卷
(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.
①a(x+y)=ax+ay;
②x2+2xy+y2-1=x(x+2y)+(y +1)(y-1);
③ax2-9a=a(x+3)(x-3);
④x2+2+ =
⑤2a3=2a·a·a.
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