3-√2 : (5-2√2)(1+√2)=

3-√2 : (5-2√2)(1+√2)
3-√2 : (5+5√2-2√2+2.2)
3-√2 : 3√2+9
jadi

3-√2 / 3√2+9 × 3√2-9 / 3√2-9

(3-√2)(3√2-9)
———————
9.2-9

(9√2-27-3.2+9√2)
—————————-
18-9

18√2-33
————-
9

maaf kalo salah y

= 3-√2: (5+5√2-2√2+2*2)
=(3-√2:1+3√2)*(1-3√2:1-3√2}
=9-10√2:-17