Question

第一题 （x-1）/（x^2/3+x^1/3+1）+（x+1）/（x^1/3+1）-（x-x^1/3）/（x^1/3-1

Answer 1

第二题√（9+4√(4+2√3))

=√（9+4√(3+2√3+1))

=√（9+4√3+4)

=√ √12^2+2√12+1

=√12+1

=2√3+1

第一题 （x-1）/（x^2/3+x^1/3+1）=（x^1/3)^3-1/（x^2/3+x^1/3+1）=x^1/3-1 又（x+1）/（x^1/3+1）=x^2/3-x^1/3+1

（x-x^1/3）/（x^1/3-1）

=x^1/3（x^1/3+1）

原式=-x^1/3