因式分解.x²y-2xy²+3xy.x²-﹙x+b﹚².x﹙x-3﹚-y﹙3-x
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因式分解.x²y-2xy²+3xy.x²-﹙x+b﹚².x﹙x-3﹚-y﹙3-x﹚.
7y﹙x-3y﹚²-2﹙3y-x﹚³.-m²-m-¼..﹙x+1﹚﹙x-1﹚-8.
25﹙a-b﹚²+10﹙a-b﹚+1.-2x⁴+8x².
7y﹙x-3y﹚²-2﹙3y-x﹚³.-m²-m-¼..﹙x+1﹚﹙x-1﹚-8.
25﹙a-b﹚²+10﹙a-b﹚+1.-2x⁴+8x².
![因式分解.x²y-2xy²+3xy.x²-﹙x+b﹚².x﹙x-3﹚-y﹙3-x](/uploads/image/z/4929290-26-0.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3.x%26%23178%3By%EF%BC%8D2xy%26%23178%3B%EF%BC%8B3xy.x%26%23178%3B%EF%BC%8D%EF%B9%99x%EF%BC%8Bb%EF%B9%9A%26%23178%3B.x%EF%B9%99x%EF%BC%8D3%EF%B9%9A%EF%BC%8Dy%EF%B9%993%EF%BC%8Dx)
x²y-2xy²+3xy=xy(x-2y+3)
x²-﹙x+b﹚²=(x+x+b)(x-x-b)=-b(2x+b)
x﹙x-3﹚-y﹙3-x﹚=x(x-3)+y(x-3)=(x-3)(x+y)
7y﹙x-3y﹚²-2﹙3y-x﹚³=7y(x-3y)²-2(x-3y)²=(x-3y)²(7y-2)
-m²-m-¼.=-(m²+m+1/4)=-(m+1/2)²
﹙x+1﹚﹙x-1﹚-8=x²-1-8=x²-9=9x+3)(x-3)
25﹙a-b﹚²+10﹙a-b﹚+1=[5(a-b)+1]²=(5a-5b+1)
-2x⁴+8x²=-2x²(x²-4)=-2x²(x+2)(x-2)
x²-﹙x+b﹚²=(x+x+b)(x-x-b)=-b(2x+b)
x﹙x-3﹚-y﹙3-x﹚=x(x-3)+y(x-3)=(x-3)(x+y)
7y﹙x-3y﹚²-2﹙3y-x﹚³=7y(x-3y)²-2(x-3y)²=(x-3y)²(7y-2)
-m²-m-¼.=-(m²+m+1/4)=-(m+1/2)²
﹙x+1﹚﹙x-1﹚-8=x²-1-8=x²-9=9x+3)(x-3)
25﹙a-b﹚²+10﹙a-b﹚+1=[5(a-b)+1]²=(5a-5b+1)
-2x⁴+8x²=-2x²(x²-4)=-2x²(x+2)(x-2)
因式分解.x²y-2xy²+3xy.x²-﹙x+b﹚².x﹙x-3﹚-y﹙3-x
[xy(x²-3y)+3xy²]﹙﹣2xy﹚+x³y²﹙2x-y﹚ 其中x=﹣1
已知x=3 y=1\3,求3x²y-[2xy²-2﹙xy-3\2x²y﹚+xy]+3xy&
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