m3-2m 25X^4-81怎麼因式分解, m^3-2m 25x^4-81 m^3:m的3次方x^4:x的4次方

m3-2m 25X^4-81怎麼因式分解, m^3-2m 25x^4-81 m^3:m的3次方x^4:x的4次方


m^3-2m
=m(m^2-2)
=m(m-√2)(m+√2)
25X^4-81
=(5x^2-9)(5x^2+9)
=(√5x-3)(√5x+3)(5x^2+9)



(m^4-81)/(3+m)/(9+m^2)因式分解


=(m^2-9)(m^2+9)/(3+m)(9+M)^2
=(m-3)(m+3)/(3+m)
=m-3



因式分解:2m^2-16m+32


2m^2-16m+32
=2(m^2-8m+16)
=3(m-4)^2



因式分解:-2m^3+16m^2+18m=


-2m^3+16m^2+18m
=-2m(m^2-8m-9)
=-2m(m-9)(m+1)