(1)m*m²*m+m²*m-m²*m²-m³ (2)½x*y*x*x-y*x*x²+x*x*y

问题描述:

(1)m*m²*m+m²*m-m²*m²-m³ (2)½x*y*x*x-y*x*x²+x*x*y