In grade one, the system learns linear equations, binary linear equations, unary linear inequalities (groups) and positive and negative proportional functions.
In the second day of junior high school, I learned the quadratic equation of one variable, simple quadratic equation of two variables, quadratic function and quadratic inequality.
Learning simple trigonometric ratio in grade three, and learning how to solve oblique triangles and sine and cosine theorems in grade three, have all been moved to high school now, which may be different from place to place. The concept and operation of logarithm, originally learned in grade three, has now been moved to grade three. Power function, exponential function and logarithmic function are all studied in Grade One, while trigonometric function and inverse trigonometric function are studied in Grade Two.
Extended data:
An equation must be an equation, but an equation is not necessarily an equation.
Example: a+b= 13 conforms to the equation, and there are unknowns. This is an equation and an equation.
1+ 1=2 , 100× 100= 10000。 These two formulas are consistent with the equation, but there are no unknowns, so they are not equations.
In the definition, the equation must be an equation, but there can be other equations, such as 1+ 1 = 2,100×10000 =10000, all of which are equations. Obviously, the range of the equation is larger.
Baidu Encyclopedia-Equation