1 =(√15)^2-3^2=15-9=6
2.=(-4√3)^2-(3√2)^2=48-18=30
4.=10^2-(√5)^2=100-5=95
6 =[(√5+√2)-√3]^2=(√5+√2)^2-2√3(√5+√2)+(√3)^2
=5+2+2√10-2√15-2√6+3=102√10-2√15-2√6
3 =(2√7)^2-3^2=28-9=19
5 =4^2+2*4*√3+(√3)^2=19+8√3
1 =(√15)^2-3^2=15-9=6
2.=(-4√3)^2-(3√2)^2=48-18=30
4.=10^2-(√5)^2=100-5=95
6 =[(√5+√2)-√3]^2=(√5+√2)^2-2√3(√5+√2)+(√3)^2
=5+2+2√10-2√15-2√6+3=102√10-2√15-2√6
3 =(2√7)^2-3^2=28-9=19
5 =4^2+2*4*√3+(√3)^2=19+8√3