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(1+2√2)-(3√2-7)-(8-√2)

Răspuns :

1+2√2-3√2+7-8+√2=
8+2√2-3√2-8+√2=
-1√2+√2=-1√2
(1+2√2)-(3√2-7)-(8-√2) =  1 + 2√2 - 3√2 + 7- 8 + √2  = 0