The square of 158 is equal to 158× 158 and 158 = 24964, so the square of158 is 24964. Square is an operation. For example, the square of a means a×a, and the abbreviation is a? It can also be written as A× A (A (the first power of A multiplied by the first power of A equals the second power of A), for example, 4×4= 16, 8×8=64, and the square sign is 2.
Want to find the square of a, is it a×a or a? , such as 5? =5×5=25,6? =6×6=36。 If the square of a and b is required, is a×a+b×b or a? +b？ , such as 4× 4+5× 5 = 16+25 = 4 1, 4? +5? = 16+25=4 1。 The formula of square root is that negative square root cannot do work, and square root is still zero. There are two positive square roots with opposite signs and the same value.
Matters needing attention in calculating the square of a number
1, understand the concept of square: square is the quadratic of a number, that is, the quadratic product of the same number. For example, the square of 5 equals 5 times 5.
2. Pay attention to symbols: the result of square root operation can be positive, negative or zero. When two numbers are multiplied, if the two numbers have the same sign, the result is positive; If two numbers have different signs, the result is negative; If one of the two numbers is zero, the result is zero.
3. Simplify the operation: When calculating the square, some simple rules can be used to simplify the calculation. For example, any number multiplied by 0 is 0, any number multiplied by 1 is the original number, and any number multiplied by-1 is the inverse of the original number.
4. Precautions when the value is too large: When the value is too large, you need to pay attention to the issues of carry and precision. For example, when calculating the 10 power of 2, you need to pay attention to carry; When calculating the area of a circle or the volume of a ball, it is necessary to maintain sufficient accuracy.
5. Using formulas: For some specific mathematical problems, formulas can be used to simplify the calculation. For example, the square root of a number can be solved by the root formula; For the cube root of a number, it can be solved by the cube root formula.