[50 Series][Trigonometric Problems][Part I] Mathematics Other

[50 Series][Geometry Problems][Part I] Mathematics Geometry

[50 Series][Algebra Problems][Part I] Mathematics Algebra

[50 Series][Geometry Problems][Part II] Mathematics Geometry

[Problem of the day][数学挑战][Algebra][代数][17] [Solve this equation][iG] Algebra

[Problem of the day][数学挑战][Integration][积分][01] [Solve this integration][P3] Calculus

[Problem of the day][数学挑战][Algebra][代数][12] [Solve this equation][iG] Algebra

[Problem of the day][数学挑战][Algebra][代数][11] [Solve this equation][P3] Algebra

[LEGO][乐高][Rhombicosidodecahedron][小斜方截半二十面体] LEGO Geometry

[Mathematica][无用的图像][Graphs][02][RegionPlot][Batman] Programming

[Mathematica][无用的图像][Graphs][01][PolarPlot][Graph of Phi] Programming

[Problem of the day][数学挑战][Numbers][数字][02][Make 10 from 1,1,5,8] Number

[Problem of the day][数学挑战][Numbers][数字][01][A 10-digit number] Number

[Problem of the day][数学挑战][Geometry][几何][9][A hard geometric problem] Geometry

[Problem of the day][数学挑战][Algebra][代数][7] [Simplifying a sum of two cube roots] Algebra

[Problem of the day][数学挑战][Algebra][代数][8] [Solve this equation without a calculator] Algebra

[Problem of the day][数学挑战][Algebra][代数][9] [Integral in Seconds] Algebra

[Problem of the day][数学挑战][Geometry][几何][8][Area of non over-lapping region] Geometry

[Problem of the day][数学挑战][Algebra][代数][10] [A Trick for Solving x,y and z] Algebra

[Problem of the day][数学挑战][Algebra][代数][6] [Solve of integer solutions for x and y] Algebra