Less than, pronounced xi m: o y ú. Use the less than sign (
Mathematicians have racked their brains to find a set of symbols of "greater than" or "less than".
1629, the French mathematician Rizal used the symbol "ff" to indicate "greater than" and the symbol "less than" in his algebra course. For example, a greater than b is la beled as "AffB" and a less than b is labeled as "ab".
163 1 year, the British mathematician harriot first created the symbol ">", which means "greater than", "3, -2b, m.
A>b is represented by the symbol "a3|2b"; B<a is represented by the symbol "b2|3a". Because these inequalities are very complicated to write, they are quickly eliminated.
Only harriot created ">" and "< ran out.
Put > organically combines the two symbols "=" to get the symbol "≥". When one value is greater than another value or two numbers are equal, use a greater than sign or an equal sign, which is read as "greater than or equal to" and sometimes called "not less than". For any two real numbers A and B, their corresponding points A and B can be found on the same axis. If point A is to the right of point B or A and B coincide, then A ≥ B..
Similarly, put "
In a proposition, less than or equal to is less than or equal to, as long as one condition is met.
Less than sign "
In the "number identification" unit of senior one, the textbook pays great attention to strengthening the understanding of the practical meaning of logarithm. After understanding 1-5, teach the understanding of logarithms and numbers, and let students connect with their own life experiences, and realize that a number can be used to represent the number of objects and the order of arrangement of objects.
We should also attach great importance to helping students establish the concept of number size and master the relationship between number size. In teaching, the examples of "=" and ">" and "<" provide a fairy tale scene of forest games, and abstract the relationship between numbers from the comparison of numbers of different animals.