Question

因式分解 总共10道 答得好的加分~

16x^-49y^

16a^-72a+81

4+12(x-y)+9(x-y)^

x³-9x

16x的四次方-1

6ab^-9a^b-b³

16-（2a+3b)^

-36x^+12xy-y^

4x(a-b)-8y(b-a)

(x^-5)^+8(x^-5)+16

Answer 1

16x^-49y^
=(4x+7y)(4x-7y)

16a^-72a+81
=(4a-9)^

4+12(x-y)+9(x-y)^
=[2+3(x-y)]^
=(2+3x-3y)^

x³-9x
=x(x^-9）
=x(x+3)(x-3)

16x的四次方-1
=(4x^+1)(4x^-1)
=(4x^+1)(2x+1)(2x-1)

6ab^-9a^b-b³
=b(6ab-9a-b^)

16-（2a+3b)^
=[4+(2a+3b)][4-(2a+3b)]
=(4+2a+3b)(4-2a-3b)

-36x^+12xy-y^
=-(36x^-12xy+y^)
=-(6x-y)^2

4x(a-b)-8y(b-a)
=(a-b)(4x+8y)
=4(a-b)(x+2y)

(x^-5)^+8(x^-5)+16
=(x^-5+4)^2
=(x^-1)^
=(x+1)^(x-1)^

追问

-4x^+25

a(a-b)-b(b-a)

最后两道

感谢感谢~

追答

-4x^+25
=-（4x^-25)
=-(2x+5)(2x-5)

a(a-b)-b(b-a)
=a(a-b)+b(a-b)
=(a-b)(a+b)