Question

(x+y)的5次方(-x-y)的6次方=？

-（x-y）的2次方*（y-x）的3次方=？
25*5的m次方*5的m-2次方=？

Answer 1

(x+y)^5(-x-y)^6
=(x+y)^5(x+y)^6
=(x+y)^(5+6)
=(x+y)^11

-(x-y)^2*(y-x)^3
=-(x-y)^2*[-(x-y)]^3
=(x-y)^2(x-y)^3
=(x-y)^(2+3)
=(x-y)^5

25*5^m*5^(m-2)
=5^2*5^m*5^(m-2)
=5^(2+m+m-2)
=5^2m