1/2 √200 - 7 √2/49 - √72=
= 1/2 *10√2- 7 * 1/7 √2 - 6√2 = 5√2 - √2 - 6√2 = - 2√2
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1/2 √200 - 7 √2/49 - √72=
= 1/2 *10√2- 7 * 1/7 √2 - 6√2 = 5√2 - √2 - 6√2 = - 2√2