Question

Efectueaza:
√2×√10-2√5=?
√6×√2×√3+√5:√5=?

Answer 1

√2×√10-2√5= √20 - 2√5 = √(4×5) - 2√5 = 2√5 - 2√5 = 0 

√6×√2×√3+√5:√5= √36 + 1 = 6 + 1 = 7 

Answer 2

$\sqrt{2} \cdot \sqrt{10}-2 \sqrt{5}= \sqrt{2\cdot10} - \sqrt{ 2^{2}\cdot5} = \sqrt{20} - \sqrt{20} =0 \\ \\ \sqrt{6}\cdot \sqrt{2}\cdot \sqrt{3} + \sqrt{5} :\sqrt{5}= \sqrt{6\cdot2\cdot3} + 1 = \sqrt{36} +1 =6+1=7$