1) V8p - V2p + V18p 2)V160c + 2V40c - 3V90c 3) 5V7m - 4V48m - 2V2m 4) 2V72 - V50 - 2V8...

1
√8p-√2p+√18p=2√2p-√2p+3√2p=4√2p
2
√160c+2√40c-3√90c=4√10c+4√10c-9√10c=-√10c
3
5√7m-4√48m-2√2m=5√7m-16√3m-2√2m
4
2√72-√50-2√8=12√2-5√2-4√2=3√2
5
$( \sqrt{4+ \sqrt{7} } + \sqrt{4- \sqrt{7} } )^2=4+ \sqrt{7} +4-\sqrt{7}$ $+2 \sqrt{16-7} =8+ \sqrt{9} =8+3=11$
6
(6-√2)²+3√32=36+4-12√2+3*4√2=40-12√2+12√2=40