\(2\sqrt{80}+3\sqrt{45}-\sqrt{5}\)
\(=2\cdot4\sqrt{5}+3\cdot3\sqrt{5}-\sqrt{5}\)
\(=\sqrt{5}\cdot\left(8+9-1\right)\)
\(=16\sqrt{5}\)
\(2\sqrt{80}+3\sqrt{45}-\sqrt{5}=2.4\sqrt{5}+3.3\sqrt{5}-\sqrt{5}=8\sqrt{5}+9\sqrt{5}-\sqrt{5}=16\sqrt{5}\)
2√80+3√45−√5280+345−5
=2⋅4√5+3⋅3√5−√5=2⋅45+3⋅35−5
=√5⋅(8+9−1)=5⋅(8+9−1)
=16√5