Commonly used mathematical formula formula classification formula expression multiplication and factorization A2-B2 = (a+b) (a-b) A3+B3 = (a+b) (A2-AB+B2) A3-B3 = (A-B (A2+AB+B2) triangular inequality | A+B |≤|+|. =>-B ≤ A ≤ B | A-B |≥| A |-B |≤ A | Solution of a quadratic equation in one variable-B+√ (B2-4ac)/2A root and coefficient x 1+. 0 Note: The equation has two unequal real roots B2-4ac 0 sector area formula s= 1/2*l*r cone volume formula V= 1/3*S*H cone volume formula V= 1/3*pi*r2h oblique prism volume V=S'L Note: Among them,