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The formula of junior high school mathematics circle is 1, and the formula of quadratic inverse proportional function is unnecessary!
Formula circumference =πd=2πr area =πr2(2 is square)
Linear function y=kx+b (k is not 0)
The general formula of quadratic function is y=ax2+bx+c (a is not 0), and the intersection of vertex y=a(x-h)2+k y=a(x-x 1)(x-x2).