Răspuns:
b) -2√3
c) 0
d) 0
Explicație pas cu pas:
b)
[tex]= \sqrt{25*3} +\sqrt{4*3} -\sqrt{81*3} =[/tex]
[tex]= 5\sqrt{3} +2\sqrt{3} -9\sqrt{3} =[/tex]
[tex]= -2\sqrt{3}[/tex]
c)
[tex]= \sqrt{4*7} +\sqrt{9*7} -5\sqrt{7} =[/tex]
[tex]=2 \sqrt{7} +3\sqrt{7} -5\sqrt{7} =[/tex]
[tex]=0[/tex]
d)
[tex]=3 \sqrt{25*2} +\sqrt{9*2} -18\sqrt{2} =[/tex]
[tex]=15 \sqrt{2} +3\sqrt{2} -18\sqrt{2} =[/tex]
[tex]=0[/tex]
