(X-Y)五次幂X(X-Y)四次幂=-(?)三次幂

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(X-Y)五次幂X(X-Y)四次幂=-(?)三次幂(X-Y)五次幂X(X-Y)四次幂=-(?)三次幂(X-Y)五次幂X(X-Y)四次幂=-(?)三次幂(X-Y)五次幂×(X-Y)四次幂=(X-Y)九次

(X-Y)五次幂X(X-Y)四次幂=-(?)三次幂
(X-Y)五次幂X(X-Y)四次幂=-(?)三次幂

(X-Y)五次幂X(X-Y)四次幂=-(?)三次幂
(X-Y)五次幂×(X-Y)四次幂
=(X-Y)九次幂
=-(Y-X)九次幂
=-[(Y-X)三次幂]三次幂
所以括号里填(Y-X)三次幂

(X-Y)九次=-(X-Y)六次
1 X-Y=0
2 X-Y=-1