Tolong di jawab yang C dan D aja.. teman²...tolong..

MATERI BENTUK AKAR 

C) Tinjau masing-masing suku.
[tex] \frac{4}{ \sqrt{3}+ \sqrt{2}}* \frac{ \sqrt{3}- \sqrt{2} }{\sqrt{3}- \sqrt{2} } =4 \sqrt{3}- 4\sqrt{2}.[/tex]
[tex] \frac{3}{ \sqrt{2}-1 }* \frac{ \sqrt{2}+1 }{\sqrt{2}+1} }=3 \sqrt{2}+3 [/tex]
[tex] \frac{5}{ \sqrt{3}- \sqrt{2}}* \frac{ \sqrt{3}+ \sqrt{2} }{\sqrt{3}+\sqrt{2} } =5 \sqrt{3}+5\sqrt{2}.[/tex]
Sehingga semuanya dapat ditulis
[tex](4 \sqrt{3}- 4\sqrt{2})-(3 \sqrt{2}+3)+(5 \sqrt{3}+5 \sqrt{2}) [/tex]
[tex]-2 \sqrt{2} +9 \sqrt{3} -3[/tex]

D) Tinjau masing-masing suku
[tex] \frac{10}{ \sqrt{5}+ \sqrt{6} } * \frac{ \sqrt{5}- \sqrt{6} }{\sqrt{5}- \sqrt{6} } =10 \sqrt{6}-10 \sqrt{5} [/tex]
[tex] \frac{12}{ \sqrt{6}+ \sqrt{7} } * \frac{ \sqrt{6}- \sqrt{7} }{\sqrt{6}- \sqrt{7} } =12 \sqrt{7}-12 \sqrt{6} [/tex]
[tex] \frac{14}{ \sqrt{7}+ \sqrt{8} } * \frac{ \sqrt{7}- \sqrt{8} }{\sqrt{7}- \sqrt{8} } =14 \sqrt{8}-14 \sqrt{7} [/tex]
Ketiga sukunya dapat ditulis
[tex](10 \sqrt{6}-10 \sqrt{5})+(12 \sqrt{7}- 12\sqrt{6})+(14 \sqrt{8}- 14\sqrt{7})[/tex]
[tex]=-10 \sqrt{5} -2 \sqrt{6} -2 \sqrt{7} +14 \sqrt{8} [/tex]