What grade did you learn the mathematical formula?

Ninth grade.

The collocation method is chapter 2 1.2. 1 in the first volume of the ninth grade mathematics textbook.

Matching method is a skill to simplify calculation in elementary algebra, which can be used to solve quadratic equations, to distinguish some polynomial graphs in analytic geometry, or to calculate some integral forms in calculus. Changing the quadratic form on the left below into the form on the right is the goal of the matching method: ax+bx+c=a(x-h)+k, where h and k are constants.

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The steps of mathematical Pythagorean theorem are more detailed. Thanks for flying 4000m above the boy's head. It took 20 seconds to know how many kilometers the plane flew every hour.

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In my junior year, I didn't understand the atomic structure in chemistry, the positive charges of electrons and neutrons, and the physical heat engine. I don't understand mathematical parabola.

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The answer to eating steamed bread on page 133 of the first volume of fifth grade mathematics

Brother Daewoo, how about math?

Go to math.

Positive and negative ordering of 10 objects in math teaching plans for large classes in kindergartens.

What is the most advanced mathematics now?