帮我答下下面分解因式
1.-2x⑶+6x⑵
2.5xy-x⑵y+xy⑵
3.-6x⑶y⑷-8x⑵y⑸+16xy⑹
4.2a(a-b)+4a(2a+3b)
5.a(a+b)(a-b)-a(a+b)⑵
6.x(x-y)⑶+y(y-x)⑶
参考答案:1.-2x⑶+6x⑵
=-2x^2(x-3)
2.5xy-x⑵y+xy⑵
=xy(5-x+y)
3.-6x⑶y⑷-8x⑵y⑸+16xy⑹
=-2xy^4(3x^2+4xy-8y^2)
4.2a(a-b)+4a(2a+3b)
=2a[a-b+2(2a+3b)]
=2a(4a+5b)
5.a(a+b)(a-b)-a(a+b)⑵
=a(a+b)(a-b-a-b)
=-2ab(a+b)
6.x(x-y)⑶+y(y-x)⑶
=(x-y)^3(x-y)
=(x-y)^4