07 mathematics three postgraduate entrance examination questions, double integral big questions, how to find double integral in polar coordinates. Details, the key is to find the upper and lower integ

07 mathematics three postgraduate entrance examination questions, double integral big questions, how to find double integral in polar coordinates. Details, the key is to find the upper and lower integral of R. The upper bound of R corresponds to the straight line x+y=2, that is, rcosθ+rsinθ=2, so the upper bound is 2/(cosθ+sinθ).

The lower bound of r corresponds to the straight line x+y= 1, that is, rcosθ+rsinθ= 1, so the upper bound is 1/(cosθ+sinθ).

Math problem, the taxi fare standard of a city is the starting price of 7 yuan.

Good high school science research magazine

What formalism do you hate most in the current education field? What are the disadvantages?

What should I do if the children in the second grade of primary school can't keep up with math listening and speaking?

Students with a lot of diet recipes.

Synchronous learning and exploration in the new classroom of Qingdao edition of mathematics; the answer to the first small question on page 82, question 6 of the sixth grade.

English course

Common auxiliary lines of mathematics big questions in senior high school entrance examination

The answer to the first volume of seventh grade math homework

Winters the Mathematical Squirrel.