tolong bantu sama caranya ya

2√8-1. 2.2√2-1. 4√2-1. 3√2-7
----------- =------------- =------------- × ----------
√18+7. 3√2+7. 3√2+7. 3√2-7
24+7-31√2
=------------------
18-7
31-31√2. 31 (1-√2)
= -----------------=--------------
11. 11