题目内容
将下列各式直接因式分①2x2+6x=______②1-9y2=______.
③a2-2a+1=______④a2+a+
=______.
③a2-2a+1=______④a2+a+
1 |
4 |
①2x2+6x=2x(x+3);
②1-9y2=1-(3y)2=(1-3y)(1+3y);
③a2-2a+1=(a-1)2;
④a2+a+
=(a+
)2.
②1-9y2=1-(3y)2=(1-3y)(1+3y);
③a2-2a+1=(a-1)2;
④a2+a+
1 |
4 |
1 |
2 |
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