Mình cần ý b,c,d ạaa

b) (3$\sqrt[]{2}$ - 5)(3$\sqrt[]{2}$ + 5)

=(3$\sqrt[]{2}$)^2-$5^{2}$ 

=18-25

=-7

c)(2$\sqrt[]{2}$ +$\sqrt[]{3}$ )^2

=(2$\sqrt[]{2}$)^2+($\sqrt[]{3}$)^2+2.2$\sqrt[]{2}$.$\sqrt[]{3}$

=8+9+2.$\sqrt[]{72}$

=17+12.$\sqrt[]{2}$ 

d)($\sqrt[]{\frac{6}{5}}$ - $\sqrt[]{\frac{5}{6}}$)^2  

=$\frac{6}{5}$ + $\frac{5}{6}$-2. $\sqrt[]{\frac{5}{6}.\frac{6}{5} }$ 

=$\frac{36+25}{30}$-2

=$\frac{61}{30} - $\frac{60}{30}$ 

=$\frac{1}{30}$ 

CHÚC BẠN HOK TỐT. CHO MIK XIN CTLHN+5 SAO NHA!!!