1. (√43-5)^2+10 (√43-0.2)= 43-10√43+25+10√43-2=66
2. 14 (1+√31)+(7-√31)^2=14+14√31+49-14√31+31= 94
3. (√2-√15)^2+(√6+√5)^2= 2-2√30+15+6+2√30+5= 28
1. 2√3 (√12+3√5)-√5 (6√3-√20)= 2√36+6√15-6√15+√100=12+10=22
2. √6 (0.5√24-8√11)-4√11 (√99-2√6)=0.5√144 -8√66-4√1089+8√66=6+132=138
3. (√162-10√5)√2+(5+√10)^2= √324-10√10+25+10√10+10=18+35=53
4. (17-√21)^2-5√3 (4√27-6.8√7)= 289-34√21+2-20√81+34√21=289+2-180=111