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Sa se efectueze:
a)[tex] \sqrt{8} + \sqrt{18} + \sqrt{32} - \sqrt{200} [/tex]


Răspuns :

=√4√2  + √9√2 + √16√2 - √100√2
= 2√2  + 3√2 + 4√2 - 10√2 
= ( 2 + 3 +4 - 10) ·√2 
 = - √2
[tex] \sqrt{8} + \sqrt{18} + \sqrt{32} - \sqrt{200} = \\ =2 \sqrt{2} +3 \sqrt{2} +4 \sqrt{2} -10 \sqrt{2} = \\ =5 \sqrt{2} +4 \sqrt{2} -10 \sqrt{2} = \\ =9 \sqrt{2} -10 \sqrt{2} = \\ =- \sqrt{2} [/tex]