12 prostych zadań z pierwiastków test wyboru a,b,c,d.... Question from @Michpi

December 2018 1 30 Report

12 prostych zadań z pierwiastków test wyboru a,b,c,d

heheheh12 $1.B \\
\sqrt[3]{-0,008}=\sqrt[3]{-\frac{8}{1000}}=-\frac{2}{10}=-0,2 \\ \\
2. D \\
\sqrt{16}+\sqrt{121}-\sqrt{169}=4+11-13=15-13=2 \\ \\
3.A \\
\sqrt{18} \cdot \sqrt{6} = \sqrt{18 \cdot 8}=\sqrt{108} \\ \\
4.D \\
\sqrt[3]{21}:\sqrt[3]{7}=\sqrt[3]{27:7}=\sqrt[3]{3} \\ \\
5.C \\
\sqrt{48}=\sqrt{16 \cdot 3}=\sqrt{16} \cdot \sqrt{3}=4\sqrt{3} \\ \\
6.B \\
2\sqrt[3]{7}=\sqrt[3]{8} \cdot \sqrt[3]{7} = \sqrt[3]{8 \cdot 7}=\sqrt[3]{56}$

$7.C \\\frac{5}{2\sqrt{2}}=\frac{5 \cdot \sqrt{2}}{2 \sqrt{2} \cdot \sqrt{2}}=\frac{5\sqrt{2}}{2 \cdot \sqrt{4}}=\frac{5\sqrt{2}}{2 \cdot 2}=\frac{5\sqrt{2}}{4} \\ \\
8.A,B \\
\frac{3}{\sqrt{5}}=\frac{3\sqrt{5}}{5} \\
\frac{\sqrt{2}}{\sqrt{5}}=\frac{\sqrt{2} \cdot \sqrt{5}}{\sqrt{5} \cdot \sqrt{5}}=\frac{\sqrt{10}}{5} \\ \\
9.A \\
\sqrt{200}=\sqrt{100 \cdot 2}=\sqrt{100} \cdot \sqrt{2}=10\sqrt{2} \\ \\
10.B \\
5\sqrt{2}= \sqrt{25} \cdot \sqrt{2}=\sqrt{25 \cdot 2}=\sqrt{50}$

$11.D \\
3\sqrt[3]{3}=\sqrt[3]{27} \cdot \sqrt[3]{3}= \sqrt[3]{27 \cdot 3}=\sqrt[3]{81} \\ \\
12.C \\
\sqrt{1 \frac{5}{27}}: \sqrt{1 \frac{1}{2}}=\sqrt{\frac{32}{27}} : \sqrt{\frac{3}{2}}=\sqrt{\frac{32}{27} : \frac{3}{2}}=\sqrt{\frac{32}{27} \cdot \frac{2}{3}}=\sqrt{\frac{64}{81}}=\frac{\sqrt{64}}{\sqrt{81}}=\frac{8}{9}$

0 votes Thanks 1