x平方-y平方-z平方-2yz因式分解
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解X^2-Y^2-Z^2-2YZ
=X^2-(Y^2+Z^2+2yz)
=X^2-(Y+Z)^2
=(X-Y-Z)(X+Y+Z)
=X^2-(Y^2+Z^2+2yz)
=X^2-(Y+Z)^2
=(X-Y-Z)(X+Y+Z)
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x^3+x^2y-xy^2-y^3
=x^2(x+y)-y^2(x+y)
=(x+y)(x^2-y^2)
=(x+y)(x+y)(x-y)
=(x+y)^2(x-y)
9m^2-6m+2n-n^2
=9m^2-n^2-6m+2n
=(3m-n)(3m+n)-2(3m-n)
=(3m-n)(3m+n-2)
x^2-4+12y-9y^2
=x^2-(3y-2)^2
=(x+3y-2)(x-3y+2)
=x^2(x+y)-y^2(x+y)
=(x+y)(x^2-y^2)
=(x+y)(x+y)(x-y)
=(x+y)^2(x-y)
9m^2-6m+2n-n^2
=9m^2-n^2-6m+2n
=(3m-n)(3m+n)-2(3m-n)
=(3m-n)(3m+n-2)
x^2-4+12y-9y^2
=x^2-(3y-2)^2
=(x+3y-2)(x-3y+2)
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