题目内容
分解因式:
①x2+6x+9=______;
②1-4x+4y2=______;
③-a2+2a-1=______.
①x2+6x+9=______;
②1-4x+4y2=______;
③-a2+2a-1=______.
①x2+6x+9=(x+3)2;
②1-4x+4y2=(1-2y)2;
③-a2+2a-1=-(a2-2a+1)=-(a-1)2.
故答案为:(x+3)2;(1-2y)2;-(a-1)2;.
②1-4x+4y2=(1-2y)2;
③-a2+2a-1=-(a2-2a+1)=-(a-1)2.
故答案为:(x+3)2;(1-2y)2;-(a-1)2;.
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