把下列各式分解因式、完整的答案 谢、

1.100分之9x²-4y⁴

2.81a⁵b⁵-ab

3.24xy²z(x+y-z)-32xyz(z-x-y)²+8xyz³(z-x-y)

1:

(9x²/100)-4y⁴

=(3x/10)²-(2y²)²

=(0.3x+2y²)(0.3x-2y²)

2:

81a⁵b⁵-ab

=ab(81a⁴b⁴-1)

=ab(9a²b²+1)(9a²b²-1)

=ab(9a²b²+1)(3ab+1)（3ab-1)

3:

24xy²z(x+y-z)-32xyz(z-x-y)²+8xyz³(z-x-y)
=-24xy²z(z-x-y)-32xyz(z-x-y)²+8xyz³(z-x-y)

=8xyz(z-x-y)(-3y-4+z²)

1）

(9x^2-4y^2)/100

=[(3x)^2-(2y)^2]/100

=(3x+2y)*(3x-2y)/100

2）

81(a^5)(b^5)-ab

=ab*{[(9a^2)(b^2)]^2-1}

=ab*[9(a^2)(b^2)+1]*[9(a^2)(b^2)-1]

=ab*[9(a^2)(b^2)+1]*[(3ab)^2-1]

=ab*[9(a^2)(b^2)+1]*(3ab+1)(3ab-1)

3）

24x(y^2)*z(x+y-z)-32xyz(z-x-y)^2+8(xyz^3)(z-x-y)

=8xyz(x+y-z)[3y+4(x+y+z)-z^2]

=8xyz(x+y-z)(4x+7y+4z-z^2)

【24x(y^2)*z(x+y-z)-32xyz(z-x-y)^2+8(xyz^2)(z-x-y)==8xyz(x+y-z)(4x+7y+3z)】

1.100分之9x²-4y⁴

=0.09x²-0.04y⁴

=(0.3x+0.2y²)(0.3x-0.2y²)