1、2a(a-b)+4a(2a+3b)
=2a[(a-b)+2(2a+3b)]
=2a(5a+5b)
=10a(a+b)
2、a(a+b)(a-b)-a(a+b)²
=a(a+b)[(a-b)-(a+b)]
=-2ab(a+b)
3、x(x-y)³+y(y-x)³
=x(x-y)³-y(x-y)³
=(x-y)(x-y)³
=(x-y)^4