An irrational number is a real number that can't be expressed as an integer or a fraction. If you write an irrational number in decimal form, it will have an infinite number of digits after the decimal point with no repeating pattern, so it's also called a non-repeating infinite decimal.
math system
Place value, simply put, means that a number represents different amounts depending on where it stands in a row. For example, the number "2" is just two ones in the ones place, but two hundreds in the hundreds place. This is the basic principle in math of using digits and place values to represent numbers, and it's the rule behind the decimal system used worldwide and the binary system used in computers.
A satellite refers to a natural celestial body that orbits a planet and moves periodically along a closed orbit. Artificial satellites can generally also be called satellites.
Werner Heisenberg Profile Werner Heisenberg was a famous German theoretical physicist, philosopher, and one of the founders of quantum mechanics. Bio: Born on December 5, 1901, in Germany.
Also called a Venn diagram, it was invented in 1881 by British mathematician John Venn. It's a way of visually showing the mathematical or logical relationships between sets. Usually, a rectangle represents the overall space, while circles or ovals represent specific sets. Overlapping circles show common elements, and separate ones indicate no intersection. You can easily see unions, intersections, and so on, though you can't list the exact elements precisely. Initially, this method mainly dealt with relationships among four sets, but later it was expanded to handle more sets. Nowadays, it's widely used in computer file management, teaching, and clinical thinking analysis.
(Microorganisms) are a general term for lower organisms that are tiny in size, simple in structure, and usually need a microscope to be observed.
The core of the fundamental theorem of calculus is the Newton-Leibniz formula.
(1) Problems involving finding speed and distance during movement, (2) Problems about finding the tangent of a curve, (3) Problems about finding length, area, volume, and center of mass, (4) Problems about finding maximum and minimum values (quadratic functions, a type of calculus).