According to the mathematical formula, the radical sign of 10 is about 3. 162. The radical number 10 can be expressed by multiplying the radical number 2 by the radical number 5, which is equal to1.414,2+0.4/kloc-2+0.4 1.465438+2.236, so it is 65438+. This is a problem about the simplification of quadratic root. The simplification of quadratic root is to change any quadratic root into the simplest quadratic root.