Question

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Answer 1

$\displaystyle 18)..( \frac{1}{5})^{-3}: \sqrt{25}=5^{3}:5=5^{2}=25; \\ \\ 19).. \sqrt{49*36*100}= \sqrt{(7*6*10)^{2} }=7*6*10=420; \\ \\ 20).. \frac{21}{ \sqrt{3} }* \sqrt{3 \frac{1}{3}}= \frac{21}{ \sqrt{3}}* \frac{ \sqrt{10} }{ \sqrt{3} }= \frac{21 \sqrt{10} }{3}=7 \sqrt{10}; \\ \\ 21).. \frac{ \sqrt[4]{16*81}* \sqrt{12} }{ \sqrt{3} }= \frac{ \sqrt[4]{(2*3)^{4}}*2 \sqrt{3}}{ \sqrt{3} }=2*3*2=12;$