（3x^y-2x+1)(-2xy)(2x-1)(x-3)-3a(a-b)^2(x-2)(x-3)-(x+5)(x-5)(a+2b-3c)(a-2b-3c)(2a+b)^2(2a-b)^2因式分解4a^2-16-2x^2-12xy^2+8xy^3a^2-4(a-b)^24x(a-b)-8y(b-a)(a+3b)^2-9(a-b)^2(x^2-5)^2+8(x^2-5)+16(a^2+b^2)^2-4a^2b^225(a+b)^2-9(a-b)^2
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（3x^y-2x+1)(-2xy)(2x-1)(x-3)-3a(a-b)^2(x-2)(x-3)-(x+5)(x-5)(a+2b-3c)(a-2b-3c)(2a+b)^2(2a-b)^2因式分解4a^2-16-2x^2-12xy^2+8xy^3a^2-4(a-b)^24x(a-b)-8y(b-a)(a+3b)^2-9(a-b)^2(x^2-5)^2+8(x^2-5)+16(a^2+b^2)^2-4a^2b^225(a+b)^2-9(a-b)^2
（3x^y-2x+1)(-2xy)
(2x-1)(x-3)
-3a(a-b)^2
(x-2)(x-3)-(x+5)(x-5)
(a+2b-3c)(a-2b-3c)
(2a+b)^2(2a-b)^2
因式分解
4a^2-16
-2x^2-12xy^2+8xy^3
a^2-4(a-b)^2
4x(a-b)-8y(b-a)
(a+3b)^2-9(a-b)^2
(x^2-5)^2+8(x^2-5)+16
(a^2+b^2)^2-4a^2b^2
25(a+b)^2-9(a-b)^2
（3x^y-2x+1)(-2xy)(2x-1)(x-3)-3a(a-b)^2(x-2)(x-3)-(x+5)(x-5)(a+2b-3c)(a-2b-3c)(2a+b)^2(2a-b)^2因式分解4a^2-16-2x^2-12xy^2+8xy^3a^2-4(a-b)^24x(a-b)-8y(b-a)(a+3b)^2-9(a-b)^2(x^2-5)^2+8(x^2-5)+16(a^2+b^2)^2-4a^2b^225(a+b)^2-9(a-b)^2
（3x^2y-2x+1)(-2xy)
=-6x^3y^2+4x^2y-2xy
(2x-1)(x-3)
=2x^2-7x+3
-3a(a-b)^2
=-3a(a^2-2ab+b^2)
=-3a^3+6a^2b-3ab^2
(x-2)(x-3)-(x+5)(x-5)
=x^2-5x+6-x^2+25
=-5x+31
(a+2b-3c)(a-2b-3c)
=(a-3c)^2-(2b)^2
=a^2-6ac+9c^2-4b^2
(2a+b)^2(2a-b)^2
=[(2a+b)(2a-b)]^2
=(4a^2-b^2)^2
=16a^4-8a^2b^2+b^4
因式分解
4a^2-16
=4(a^2-4)
=4(a-2)(a+2)
-2x^2-12xy^2+8xy^3
=-2x(x+6y^2-4y^3)
a^2-4(a-b)^2
=[a-2(a-b)][a+2(a-b)]
=(2b-a)(3a-2b)
4x(a-b)-8y(b-a)
=4x(a-b)+8y(a-b)
=4(a-b)(x+2y)
(a+3b)^2-9(a-b)^2
=[(a+3b)-3(a-b)][(a+3b)+3(a-b)]
=(6b-2a)*4a
=8a(3b-a)
(x^2-5)^2+8(x^2-5)+16
=(x^2-5+4)^2
=(x^2-1)^2
=[(x-1)(x+1)]^2
=(x-1)^2(x+1)^2
(a^2+b^2)^2-4a^2b^2
=[(a^2+b^2)-2ab][(a^2+b^2)+2ab]
=(a-b)^2(a+b)^2
25(a+b)^2-9(a-b)^2
=[5(a+b)-3(a-b)][5(a+b)+3(a-b)]
=(2a+8b)(8a+2b)
=4(a+4b)(4a+b)
这些作业难吗？
你要是独立完成，应该最好！！！
（3x^y-2x+1)(-2xy)=3XY-2X+1-2XY=XY-2X+1
(2x-1)(x-3)=2X^-7X+3
-3a(a-b)^2=-6a(a-b)^
原式＝X^-5X+6-X^+25=-5X+20
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