Đáp án:
$\begin{array}{l}
1)\sqrt {100} - \sqrt {81} = 10 - 9 = 1\\
2)\sqrt {64} - \sqrt {49} = 8 - 7 = 1\\
3)\sqrt {36} - \sqrt {25} = 6 - 5 = 1\\
4)\sqrt {16} - \sqrt 9 = 4 - 3 = 1\\
5)2.3.4 = 24\\
6)10 - 9 + 8 - 7 = 1 + 1 = 2\\
7)1.6.3.2 = 36\\
8)5x - 3x = 2x\\
9)2\left( {2 + 2x} \right) = 4 + 4x\\
10)4\left( {3 - x} \right) = 12 - 4x
\end{array}$