①(a+b)²·(-a-b)²·(b+a)³
解原式=①(a+b)²·(a+b)²·(b+a)³
=(a+b)^(2+2+3)
= (a+b)^7
②(x+y)³·(-x-y)五次方·(-x-y)四次方
=(x+y)³·【-(x+y)】五次方·(x+y)四次方
= -(x+y)^(3+5+4)
= -(x+y)^12
①(a+b)²·(-a-b)²·(b+a)³
解原式=①(a+b)²·(a+b)²·(b+a)³
=(a+b)^(2+2+3)
= (a+b)^7
②(x+y)³·(-x-y)五次方·(-x-y)四次方
=(x+y)³·【-(x+y)】五次方·(x+y)四次方
= -(x+y)^(3+5+4)
= -(x+y)^12