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3√4·100-5·12 kreska8=3·2·10-60 kreska8=60-60 kreska8=0
h)5-√5 kreska√45=5√45-√5·45 kreska45=5√45-√225 kreska45=5√9·5-15 kreska45=5·3√5-15 kreska45=15√5-15 kreska45=√5-5
9a)2-√2kreska√2+1=(2-√2)(√2-1)kreska(√2+1)(√2-1)=2√2-2-2+√2kreska2-1=
3√2-4
g)9-√7kreska3√7+1=(9-√7)(3√7-1)kreska(3√7+1)(3√7-1)=
27√7-9-21+√7kreska9·7-1=28√7-30kreska62=2(14√7-15)kreska62=
14√7-15kreska31
h)2√12-3√3kr1-5√3=(2√12-3√3)(1+5√3)kr(1-5√3)(1+5√3)=
2√12+10√36-3√3-15√9kr1-25·3=2√4·3+10·6-3√3-15·3kr1-75=
4√3+60-3√3-45kr-74=√3+15kr-74
j)8-3√20kr5-2√5=(8-3√20)(5+2√5)kr(5-2√5)(5+2√5)=
40+16√5-15√20-6√100kr25-4·5=40+16√5-15√4·5-15·2√5-60kr5=
40-16√5-30√5-60kr5=-20-46√5kr5
k)2√75-6kr2√3-4=(2√75-6)(2√3+4)kr(2√3-4)(2√3+4)=
4√75·3+8√75-12√3-24kr4·3-16=4√225+8√3·25-12√3-24kr12-16=
4·15+8·5√3-12√3-24kr-4=60+40√3-12√3-24kr-4=36+28√3kr-4=4(9+7√3)kr-4=-(9+7√3)=-9-7√3
f)7√6kr2√3+6=(7-8√6)(2√3-6)kr(2√3+6)(2√3-6)=14√3-42-16√18+48kr4·3-36=14√3-42-16√9·2+48kr12-36=14√3+6-16·3√2kr-24=14√3+6-48√2kr-24=2(7√3+3-24√3)-24=2√3+3-24√2kr-12
i)-√27+3√3kr7-4√3=(-√27+3√3)(7+4√3)kr(7-4√3)(7+4√3)=-7√27+4√27·3+21√3+12·3kr49-16·3=-7√9·3+4√81+21√3+36kr49-48=-7·3√3+4·9+21√3+36kr1=-21√3+36+21√3+36=72
l)√3-1/2kr1,5-√3=(√3-1/2)(1,5+√3)kr(1,5-√3)(1,5+√3)=1,5√3+3-3/4-0,5√3kr2,25-3=√3+2,25kr-0,75