因式分解18a²-50
18a²-50
=2*(9a^2-25)
=2*(3a+5)*(3a-5)
81x的四次方-72x²y²+16y的四次方
81^4-72x^2y^2+16y^4
=(9x^2)^2-72x^2y^2+(4y^2)^2
=(9x^2-4y^2)^2
=[(3x)^2-(2y)^2]^2
=(3x+2y)^2*(3x-2y)^2
x的三次方-4x²y+xy²
x^3-4x^2y+xy^2
=x*(x^2-4xy+y^2)
x的三次方-x
x^2-x
=x*(x^2-1)
=x*(x+1)*(x-1)
6ab²-9a²b-b的...全部
18a²-50
=2*(9a^2-25)
=2*(3a+5)*(3a-5)
81x的四次方-72x²y²+16y的四次方
81^4-72x^2y^2+16y^4
=(9x^2)^2-72x^2y^2+(4y^2)^2
=(9x^2-4y^2)^2
=[(3x)^2-(2y)^2]^2
=(3x+2y)^2*(3x-2y)^2
x的三次方-4x²y+xy²
x^3-4x^2y+xy^2
=x*(x^2-4xy+y^2)
x的三次方-x
x^2-x
=x*(x^2-1)
=x*(x+1)*(x-1)
6ab²-9a²b-b的三次方
6ab^2-9a^2b-b^3
=-b*(b^2-6ab+9a^2)
=-b*(b-3a)^2
x的四次方-2x²y²+y的四次方
x^4-2x^2y^2+y^4
=(x^2-y^2)^2
=(x+y)^2*(x-y)^2
(a²-a)²(a-1)²
[a(a-1)]^2*(a-1)^2
=a^2*(a-1)^2*(a-1)^2
=a^2*(a-1)^4。
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