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$5 \sqrt{92} - \sqrt{2300} =5 \sqrt{4*23} - \sqrt{23*100} =5*2 \sqrt{23} -10 \sqrt{23} =0$

79-4

$\sqrt{24} +8 \sqrt{6} =2 \sqrt{6} +8 \sqrt{6} =10 \sqrt{6}$

80
1) $\sqrt{28} + \sqrt{63} = \sqrt{4*7} + \sqrt{7*9} =2 \sqrt{7} +3 \sqrt{7} =5 \sqrt{7}$
2) $\sqrt{99} - \sqrt{176} = \sqrt{9*11} - \sqrt{16*11} = 3\sqrt{11} -4 \sqrt{7} =-1 \sqrt{11}$
3) $2\sqrt{50} -5 \sqrt{200} = 2\sqrt{25*2} -5 \sqrt{100*2} =10 \sqrt{2} -50 \sqrt{2} =-40 \sqrt{2}$