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Mathematics
Mathematics
Problem
Calculate
4
5
×
20
\displaystyle \frac{4}{\sqrt{5}}\times \sqrt{20}
5
4
×
20
and choose the correct result. a)
8
5
8\sqrt{5}
8
5
b)
16
16
16
c)
8
8
8
d)
4
15
4\sqrt{15}
4
15
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