Question

[Emma]

1)  \(\sqrt{25-9}\)

2) \(\sqrt{0,01}-\sqrt{0,25}\)

3)  \(\left(\sqrt{\frac{4}{9}_{ }+}\sqrt{\frac{25}{144}}-\sqrt{\frac{49}{81}}\right):\sqrt{\frac{121}{36}}\)

4)\(-5.\sqrt{\frac{9}{25}_{ }+6.\sqrt{\frac{1}{4}-5.\sqrt{0,25}}}\)

5) A = \(\left(2\frac{1}{3}+3,5\right):\left(-4\frac{1}{6}+3\frac{1}{7}\right)+7,5\)

Mg các bạn giúp mình ạ

Answer 1

[Member lỗi thời :>>]

1) \(\sqrt{25-9}=\sqrt{16}\) \(=\pm4\)

2) \(\sqrt{0,01}-\sqrt{0,25}\)

\(=\sqrt{\frac{1}{100}}-\sqrt{\frac{25}{100}}\)

\(=\frac{1}{10}-\frac{5}{10}\)

\(=\frac{-4}{10}\)

Answer 2

[Member lỗi thời :>>]

3)\(\left(\sqrt{\frac{4}{9}}+\sqrt{\frac{25}{144}}-\sqrt{\frac{49}{81}}\right):\sqrt{\frac{121}{36}}\)

\(=\left(\frac{\text{2}}{3}+\frac{5}{12}-\frac{7}{9}\right):\frac{11}{6}\)

\(=\frac{11}{36}:\frac{11}{6}=\frac{1}{6}\)