Question

Bài 1 : Tính giá trị biểu thức :

1/ 0,2.\(\sqrt{100}\) -\(\sqrt{\dfrac{16}{25}}\)

2/ \(\dfrac{2^7.9^{3^{ }}}{6^5.8^2}\)

3/\(\sqrt{0,01}\) - \(\sqrt{0,25}\)

4/ 0,5 . \(\sqrt{100}\) - \(\sqrt{\dfrac{1}{4}}\)

5/ 7. \(\sqrt{0,01}\) + 2.\(\sqrt{0,25}\)

6/ 0,5.\(\sqrt{100}\) - \(\sqrt{\dfrac{1}{25}}\)

Answer 1

1.

0,2 . \(\sqrt{100}\) - \(\sqrt{\dfrac{16}{25}}\)

= 0,2 . 10 - \(\dfrac{4}{5}\)

= 2 - \(\dfrac{4}{5}\)

= \(\dfrac{6}{5}\)

Answer 2

1/ \(0,2.\sqrt{100}-\sqrt{\dfrac{16}{25}}\)

\(=0,2.10-0,8\)

\(=2-0,8=1,2\)

2/ \(\dfrac{2^7.9^3}{6^5.8^2}\)

\(=\dfrac{93312}{497664}=\dfrac{3}{16}=0,1875\)

3/ \(\sqrt{0,01}-\sqrt{0,25}\)

\(=0,1-0,5\)

\(=-0,4\)

4/ \(0,5.\sqrt{100}-\sqrt{\dfrac{1}{4}}\)

\(=0,5.10-0,5\)

\(=5-0,5=4,5\)

5/ \(7.\sqrt{0,01}+2.\sqrt{0,25}\)

\(=7.0,1+2.0,5\)

\(=0,7+1=1,7\)

6/ \(0,5.\sqrt{100}-\sqrt{\dfrac{1}{25}}\)

\(=0,5.10-0,2\)

\(=5-0,2=4,8\)