Bài làm :
e, `\sqrt{1,3.52.10}`
`=\sqrt{13.52}`
`=\sqrt{13.13. 4}`
`=\sqrt{13^2. 4}`
`=\sqrt{13^2}.\sqrt{4}`
`=13.2`
`=26`
g, `\sqrt{2,7.5.1,5}`
`=\sqrt{27.0,1.5.1,5}`
`=\sqrt{9.3.0,5.0,5.3}`
`=\sqrt{9. 3^2 . 0,5^2}`
`=\sqrt{9}.\sqrt{3^2}.\sqrt{0,5^2}`
`=3.3.0,5`
`=4,5`
Bài 2 :
a, `\sqrt{\frac{1}{9}.0,04.64}`
`=\sqrt{\frac{1}{9}}.\sqrt{0,04}.\sqrt{64}`
`=1/3 . 0,2 . 8`
`=8/15`
b, `\sqrt{11 \frac{1}{9}}`
`=\sqrt{\frac{100}{9}`
`=\sqrt{100}/(\sqrt{9})`
`=10/3`
c, `\sqrt{\frac{1}{144} . 2 \frac{2}{49}}`
`=\sqrt{\frac{1}{144} . \frac{100}{49}}`
`=\sqrt{\frac{1}{144}} . \sqrt{\frac{100}{49}}`
`=\sqrt{1}/\sqrt{144} . \sqrt{100}/\sqrt{49}`
`=1/12 . 10/7`
`=5/42`
d, `\sqrt{ 1 \frac{9}{16} . 2 \frac{1}{4} . 2 \frac{7}{9}}`
`=\sqrt{\frac{25}{16} . \frac{9}{4} . \frac{25}{9}}`
`=\sqrt{\frac{25}{16}} . \sqrt{\frac{9}{4}} . \sqrt{\frac{25}{9}}`
`=\sqrt{25}/\sqrt{16} . \sqrt{9}/\sqrt{4} . \sqrt{25}/\sqrt{9}`
`=5/4 . 3/2 . 5/3`
`=25/8`
