x的3a次方=3
x的6a次方+2x的4a次方乘以-3xde 5a次方
=3²-6(x的9a次方)
=9-6×27
=-153能再具体点吗x的6a次方+2x的4a次方乘以-3xde 5a次方=(x的3a次方)²-6[x的(4a+5a)次方]=(x的3a次方)²-6(x的3a次方)³=3²-6×3³=9-162=-153