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)