(x-y)*2(x-y)的平方*(y-x)的三次方
=-2(x-y)*(x-y)的平方*(x-y)的三次方
=-2(x-y)的(1+2+3)次方
=-2(x-y)的6次方
(x-y)*(x-y)的三次方*(y-x)的平方*(x-y)的四次方
=(x-y)*(x-y)的三次方*(x-y)的平方*(x-y)的四次方
=(x-y)的(1+3+2+4)次方
=(x-y)的10次方
一题(x-y)*2(x-y)的平方*(y-x)的三次方
=(x-y)²*(x-y)²*[-(x-y)³]
=-(x-y)^7
二题(x-y)*(x-y)的三次方*(y-x)的平方*(x-y)的四次方
=(x-y)(x-y)³(x-y)²(x-y)^4
=(x-y)^10
(x-y)*2(x-y)^2*(y-x)^3=-2(x-y)^6;
二题(x-y)*(x-y)^3*(y-x)^2*(x-y)^4=(x-y)^10。