x五次方乘以x四次方-x六次方乘以x二次方乘以x

---

x ^ 5 × x ^ 4 - x ^ 6 × x ^ 2 × x
= x ^ (5 + 4) - x ^ (6 + 2 + 1)
= x ^ 9 - x ^ 9
= 0

---

0

---

0

---