如图,因式分解...
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如图,因式分解...如图,因式分解... 如图,因式分解...9(x-y)^2+6x-6y+1=9(x-y)^2+6(x-y)+1=[3(x-y)+1]^2=(3x-3y+1)^281x^4
如图,因式分解...
如图,因式分解...
如图,因式分解...
9(x-y)^2+6x-6y+1
=9(x-y)^2+6(x-y)+1
=[3(x-y)+1]^2
=(3x-3y+1)^2
81x^4-y^4
=(9x^2+y^2)(9x^2-y^2)
=(9x^2+y^2)(3x+y)(3x-y)
(x^2-6)^2-6(x^2-6)+9
=[(x^2-6)-3]^2
=[(x^2-9)]^2
=(x+3)^2(x-3)^2
-a^4+2a^2b^2-b^4
=-(a^4-2a^2b^2+b^4)
=-(a^2-b^2)^2
=-(a+b)^2(a-b)^2