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calculati a)3 radical din 7 +2 radical din 7 +10radical din 7
b)
[tex] \\ b)8 \sqrt{2} + 12 \sqrt{2} + 3 \sqrt{2} \\ c)10 \sqrt{5} - 3 \sqrt{5} + 2 \sqrt{5} \\ d) - 3 \sqrt{3} + 8 \sqrt{3} + 6 \sqrt{3} - 9 \sqrt{3} [/tex]
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Răspuns :

a)

[tex]3 \sqrt{7} + 2 \sqrt{7} + 10 \sqrt{7} = (3 + 2 + 10) \sqrt{7} = 15 \sqrt{7} [/tex]

b)

[tex]8 \sqrt{2} + 12 \sqrt{2} + 3 \sqrt{2} = (8 + 12 + 20 ) \sqrt{2} = 40 \sqrt{2} [/tex]

c)

[tex]10 \sqrt{5} - 3 \sqrt{5} + 2 \sqrt{5} = (10 - 3 + 2) \sqrt{5} = 9 \sqrt{5} [/tex]

d)

[tex] - 3 \sqrt{3} + 8 \sqrt{3} + 6 \sqrt{3} - 9 \sqrt{3} = ( - 3 + 8 + 6 - 9) \sqrt{3} = 2 \sqrt{3} [/tex]