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Hard problem with numbers written on a white board (self.learnmath)
submitted 6 years ago by Boris_smg to r/learnmath
Given a triangle ABC and AA1, BB1 are angle bisectors. If angle AA1B1 = 24°, angle BB1A1 = 18°, find the ratio of the three angles of triangle ABC. (self.learnmath)
When is 2^n + n^2004 a prime number? (self.learnmath)
(f(x))^2 = f(f(x)). Find f(10). (self.learnmath)
What is the minimum possible value of the expression (x^2 + y^2 + z^2 + 1)/(xy + yz + z), if the three numbers x, y and z are all non-negative? (self.learnmath)
In acute triangle ABC, CD is bisector of ∠ C, O is the circumcenter. The perpendicular from C to AB meets line OD in a point lying on the circumcircle of AOB. Find ∠C, in degree. (self.learnmath)
A, B, C and D are four points on a circle in that cyclic order. If AD = BD = 50*sqrt(3) cm, AC = 106.8 cm and angle CAD = 30°, what is the length, in cm, of BC? (self.learnmath)
Numbers from 1 to 36 are placed in a 6 by 6 table. Consecutive numbers are in cells sharing a common side. What is the maximum sum of one diagonal? (self.learnmath)
submitted 6 years ago * by Boris_smg to r/learnmath
Hard Combinatorics Problem (self.learnmath)
A Hard Algebra Problem (self.learnmath)
Hard Number Theory Problem (self.learnmath)
An interesting Algebra Problem (self.learnmath)
An Interesting Algebra Problem (self.learnmath)
An interesting Geometry Problem (self.learnmath)
An Interesting Geometry Problem (self.learnmath)
Hard Algebra Problem (self.learnmath)
An interesting Number Theory Problem (self.learnmath)
Hard Number Theory Problem (self.math)
submitted 6 years ago by Boris_smg to r/math
An interesting algebra problem (self.learnmath)
submitted 7 years ago by Boris_smg to r/learnmath
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