The approximate value of root number 2 is 1.4 142 1.

The root sign is a symbol used to represent the root operation of a number or an algebra. If a? =b, then A is the n-th square root of B or A is the 1/n power of B. The root number or algebraic expression is written in the area enclosed by the right side of the symbol √ ~ and a horizontal part above the symbol, and cannot be out of bounds.

In the range of real numbers,

(1) Even root number cannot be negative, and its operation result is not negative.

(2) It can be negative under odd root sign.

Extended data:

Symbolize history

The earliest root sign ""originated from the deformation of the letter "L" (from the initial letter of Latin latus, meaning "side length"), and there was no line bracket (that is, the horizontal line on the square root sign). Later, the mathematician Descartes added line brackets to it, but it was separated from the previous square root symbol, so it was very confusing in the complicated formula.

Until the middle of18th century, the mathematician Lu Bei wrote the square root symbol and line brackets in front, and wrote the root sign in the upper left corner of the root sign to indicate the higher-order square root (omitted when the root sign is 2). )。 As a result, the familiar symbol of radical operation was formed.

Because of the input problem in the computer, we can sometimes use sqrt(a, b) to represent the b-th root of A.

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