Răspuns :
a)
[tex]8 \sqrt{2} + 4( \sqrt{5}-2 \sqrt{2} )-3 \sqrt{5} =[/tex]
[tex]8 \sqrt{2} +4 \sqrt{5} -8 \sqrt{2} -3 \sqrt{5} =[/tex]
[tex]8 \sqrt{2} +4 \sqrt{5} -8 \sqrt{2} -3 \sqrt{5} = \sqrt{5} (4-3)= \sqrt{5} [/tex]
b)
[tex]15 \sqrt{3} -3( \sqrt{7} +5 \sqrt{3} )-2 \sqrt{7} =[/tex]
[tex]15 \sqrt{3} -3 \sqrt{7} +15 \sqrt{3} -2 \sqrt{7} =[/tex]
[tex]15 \sqrt{3} -3 \sqrt{7} +15 \sqrt{3} -2 \sqrt{7} =30 \sqrt{3} -5 \sqrt{7} [/tex]
c)
[tex] \sqrt{3} ( \sqrt{2} -2 \sqrt{5} )+ \sqrt{60} - \sqrt{24} =[/tex]
[tex]\sqrt{3} \sqrt{2} -2 \sqrt{3} \sqrt{5} + 2 \sqrt{5} \sqrt{3} - 2 \sqrt{2} \sqrt{3} =[/tex]
[tex]- \sqrt{3} \sqrt{2} [/tex]
d)
[tex]\sqrt{7} \sqrt{3} -2 \sqrt{7} \sqrt{8} +5*2 \sqrt{2} \sqrt{7} - 2*2 \sqrt{3} \sqrt{7} [/tex]
[tex]\sqrt{3} \sqrt{7} (1-4)-2*2 \sqrt{7} \sqrt{2} +10 \sqrt{2} \sqrt{7} =[/tex]
[tex]-3\sqrt{3} \sqrt{7} +\sqrt{2} \sqrt{7} (10-4)=6 \sqrt{2} \sqrt{7} -3 \sqrt{3} \sqrt{7} = 3 \sqrt{7} (2 \sqrt{2}- \sqrt{3} )[/tex]
[tex]8 \sqrt{2} + 4( \sqrt{5}-2 \sqrt{2} )-3 \sqrt{5} =[/tex]
[tex]8 \sqrt{2} +4 \sqrt{5} -8 \sqrt{2} -3 \sqrt{5} =[/tex]
[tex]8 \sqrt{2} +4 \sqrt{5} -8 \sqrt{2} -3 \sqrt{5} = \sqrt{5} (4-3)= \sqrt{5} [/tex]
b)
[tex]15 \sqrt{3} -3( \sqrt{7} +5 \sqrt{3} )-2 \sqrt{7} =[/tex]
[tex]15 \sqrt{3} -3 \sqrt{7} +15 \sqrt{3} -2 \sqrt{7} =[/tex]
[tex]15 \sqrt{3} -3 \sqrt{7} +15 \sqrt{3} -2 \sqrt{7} =30 \sqrt{3} -5 \sqrt{7} [/tex]
c)
[tex] \sqrt{3} ( \sqrt{2} -2 \sqrt{5} )+ \sqrt{60} - \sqrt{24} =[/tex]
[tex]\sqrt{3} \sqrt{2} -2 \sqrt{3} \sqrt{5} + 2 \sqrt{5} \sqrt{3} - 2 \sqrt{2} \sqrt{3} =[/tex]
[tex]- \sqrt{3} \sqrt{2} [/tex]
d)
[tex]\sqrt{7} \sqrt{3} -2 \sqrt{7} \sqrt{8} +5*2 \sqrt{2} \sqrt{7} - 2*2 \sqrt{3} \sqrt{7} [/tex]
[tex]\sqrt{3} \sqrt{7} (1-4)-2*2 \sqrt{7} \sqrt{2} +10 \sqrt{2} \sqrt{7} =[/tex]
[tex]-3\sqrt{3} \sqrt{7} +\sqrt{2} \sqrt{7} (10-4)=6 \sqrt{2} \sqrt{7} -3 \sqrt{3} \sqrt{7} = 3 \sqrt{7} (2 \sqrt{2}- \sqrt{3} )[/tex]