因式分解,,谢谢
2个回答
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x^2-1=(x-1)(x+1)
1-4y^2=(1-2y)(1+2y)
81x^2-64y^2=(9x-8y)(9x+8y)
x^2+4x+4=(x+2)^2
4x^2+4x+1=(2x+1)^2
x^2-mn+1/4n^2=(m-1/2n)^2
-1/2a^2+ab-1/2b^2=-1/2(a^2-2ab+b^2)=-1/2(a-b)^2
-4ab+a^2+4b^2=-(a^2-4ab+4b^2)=-(a-2b)^2
x^3y-2x^2y+xy=xy(x^2-2x+1)=xy(x-1)^2
1-4y^2=(1-2y)(1+2y)
81x^2-64y^2=(9x-8y)(9x+8y)
x^2+4x+4=(x+2)^2
4x^2+4x+1=(2x+1)^2
x^2-mn+1/4n^2=(m-1/2n)^2
-1/2a^2+ab-1/2b^2=-1/2(a^2-2ab+b^2)=-1/2(a-b)^2
-4ab+a^2+4b^2=-(a^2-4ab+4b^2)=-(a-2b)^2
x^3y-2x^2y+xy=xy(x^2-2x+1)=xy(x-1)^2
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