Question

Tính giá trị biểu thức:

\(\left(2\sqrt{3}\right)^2\)\(-\left(3\sqrt{2}\right)^2\)\(+\left(4\sqrt{0,5}\right)^2\)\(-\left(\frac{1}{5}\sqrt{125}\right)^2\)

Answer 1

\(\left(2\sqrt{3}\right)^2-\left(3\sqrt{2}\right)^2+\left(4\sqrt{0,5}\right)^2-\left(\frac{1}{5}\sqrt{125}\right)^2\)

\(=2^2.3-3^2.2+4^2.0,5-5\)

\(=12-18+8-5\)

\(=-3\)

Answer 2

                                                           Bài giải

\(\left(2\sqrt{3}\right)^2-\left(3\sqrt{2}\right)^2+\left(4\sqrt{0,5}\right)^2-\left(\frac{1}{5}\sqrt{125}\right)^2\)

\(=2^2\cdot3-3^2\cdot2+4^2\cdot0,5-\frac{1}{25}\cdot125\)

\(=12-18+8-5\)

\(=-3\)

Answer 3

\(\left(2\sqrt{3}\right)^2-\left(3\sqrt{2}\right)^2+\left(4\sqrt{0,5}\right)^2-\left(\frac{1}{5}\sqrt{125}\right)^2\)

\(=2^2\cdot3-3^2\cdot2+4^2\cdot0,5-\frac{1}{25}\cdot125\)

\(=12-18+8-5\)

\(=-3\)