1.y(x+y)+(x-y)^2-x^2-2y^22.(x^3+4)^2-16(x-1)(x+1)-(x^3-4)^23.x^3-x4.-2(m-n)^2+325.(a+2b)^2-4(a-b)^2

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1.y(x+y)+(x-y)^2-x^2-2y^22.(x^3+4)^2-16(x-1)(x+1)-(x^3-4)^23.x^3-x4.-2(m-n)^2+325.(a+2b)^2-4(a-b)^21

1.y(x+y)+(x-y)^2-x^2-2y^22.(x^3+4)^2-16(x-1)(x+1)-(x^3-4)^23.x^3-x4.-2(m-n)^2+325.(a+2b)^2-4(a-b)^2
1.y(x+y)+(x-y)^2-x^2-2y^2
2.(x^3+4)^2-16(x-1)(x+1)-(x^3-4)^2
3.x^3-x
4.-2(m-n)^2+32
5.(a+2b)^2-4(a-b)^2

1.y(x+y)+(x-y)^2-x^2-2y^22.(x^3+4)^2-16(x-1)(x+1)-(x^3-4)^23.x^3-x4.-2(m-n)^2+325.(a+2b)^2-4(a-b)^2
答：
1.原式
=xy+y^2+x^2+y^2-2xy-x^2-2y^2
=-xy
2.原式
=x^6+8x^3+16-16x^2+16-x^6+8x^3-16
=16x^3-16x^2+16
=16(x^3-x^2+1)
3.原式
=x(x^2-1)
=x(x+1)(x-1)
4.原式
=2[16-(m-n)^2]
=2(4+m-n)(4-m+n)
5.原式
=(a+2b-2a+2b)(a+2b+2a-2b)
=3a(4b-a)

3=x(x^2-1)=x(x+1)(x-1)
由于没有时间帮你算了，你可以将所有式子全部把括号算出来，再找因式分解的公式对照，很简单的

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