答：x^3+x--(2/x)+8/(x^2)
b)hence factorize the expression in (a)
答：(x-(2/x))((x^2)+3+(4/(x^2)))
2.9^x=√3,x=?
答：1/4
3.if log x:log y=m:n,then x=?
答：y^(m/n)
4.in factorizing the expression we find that
(a^2-ab+b^2)is a factor.為什麼？
更新1:
4.in factorizing the expression a^4+ a^(2)b^(2)+ b^4 we find that (a^2-ab+b^2)is a factor.為什麼？
更新2:
1.x^3+x-(2/x)-8/(x^3)
