a: \(\sqrt{10}\cdot\sqrt{40}=\sqrt{400}=20\)
b: \(\sqrt{5}\cdot\sqrt{45}=\sqrt{225}=15\)
c: \(\sqrt{52}\cdot\sqrt{13}=\sqrt{676}=26\)
d: \(\sqrt{2}\cdot\sqrt{162}=\sqrt{324}=18\)
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