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0,2 ×5√2 +0,8 ×6√2 - 0,3×4√2 =
√2 + 4,8√2 - 1,2√2 = 4,6√2
2. = 3×√4×5 - 1/3×√9×5 -5×√36×5 =
3×2√5 - 1/3×3√5 - 5×6√5 =
6√5 - √5 - 30√5 = - 25√5