Question

\(\dfrac{9}{\sqrt{\left(-11\right)^2}}\) - \(|\sqrt{0,04}-\sqrt{7}|\) - \(\left(20\dfrac{9}{11}-\sqrt{7}+1,7\right)\)

Answer 1

\(\dfrac{9}{\sqrt{\left(-11\right)^2}}-\left|\sqrt{0,04}-\sqrt{7}\right|-\left(20\dfrac{9}{11}-\sqrt{7}+1,7\right)\)
\(=\dfrac{9}{11}-\left|\sqrt{7}-\sqrt{0,04}\right|-20\dfrac{9}{11}+\sqrt{7}-1,7\)
\(=\dfrac{9}{11}-\sqrt{7}-\sqrt{0,04}-\dfrac{229}{11}+\sqrt{7}-1,7\)
\(=\dfrac{9}{11}-\sqrt{7}-0,2-\dfrac{229}{11}+\sqrt{7}-1,7\)
\(=\left(\dfrac{9}{11}-\dfrac{299}{11}\right)+\left(\sqrt{7}-\sqrt{7}\right)-\left(-0,2+1,7\right)\)
\(=\dfrac{-220}{11}+0-1,5\)
\(=-20-1,5\)
\(=-21,5\)

Answer 2

Làm lại ạ:
\(\dfrac{9}{\sqrt{\left(-11\right)^2}}-\left|\sqrt{0,04}-\sqrt{7}\right|-\left(20\dfrac{9}{11}-\sqrt{7}+1,7\right)\)
\(=\dfrac{9}{11}-\left|\sqrt{7}-\sqrt{0,04}\right|-20\dfrac{9}{11}+\sqrt{7}-1,7\)
\(=\dfrac{9}{11}-\sqrt{7}+\sqrt{0,04}-\dfrac{229}{11}+\sqrt{7}-1,7\)
\(=\dfrac{9}{11}-\sqrt{7}+0,2-\dfrac{229}{11}+\sqrt{7}-1,7\)
\(=\left(\dfrac{9}{11}-\dfrac{229}{11}\right)+\left(\sqrt{7}-\sqrt{7}\right)-\left(-0,2+1,7\right)\)
\(=\dfrac{-220}{11}+0-1,5\)
\(=-20-1,5\)
\(=-21,5\)