Question

tính

Answer 1

3: \(\sqrt{\dfrac{1}{4}}+\sqrt{\dfrac{1}{9}}+\sqrt{\dfrac{1}{36}}+\sqrt{\dfrac{1}{16}}\)

\(=\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{6}+\dfrac{1}{4}\)

\(=\dfrac{3}{6}+\dfrac{2}{6}+\dfrac{1}{6}+\dfrac{1}{4}\)

\(=1+\dfrac{1}{4}=\dfrac{5}{4}\)

4: \(\sqrt{0,04}+\sqrt{0,09}+\sqrt{\dfrac{9}{25}}\)

\(=0,2+0,3+\dfrac{3}{5}\)

=0,5+0,6

=1,1

5: \(2\sqrt{4}+4\sqrt{9}+6\sqrt{25}-4\sqrt{16}+\sqrt{0}\)

\(=2\cdot2+4\cdot3+6\cdot5-4\cdot4+0\)

=4+12+30-16

=30

6: \(3\sqrt{16}+2\sqrt{25}+8\sqrt{64}-3\sqrt{81}\)

\(=3\cdot4+2\cdot5+8\cdot8-3\cdot9\)

=12+10+64-27

=22-27+64

=-5+64

=59