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

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

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

(1)m*m²*m+m²*m-m²*m²-m³ (2)½x*y*x*x-y*x*x²+x*x*y
(1)m*m²*m+m²*m-m²*m²-m³
=m的4次方 + m³ - m的4次方 - m³
=0
(2)½x*y*x*x-y*x*x²+x*x*y
=½x³y - x³y + x²y
=-½x³y+x²y
=-½x²y(x-2)