Draw a straight line within the surface of a clock to separate it into 2 portions. Summation of the numbers in one of the portion equal to 2 times the summation of the numbers in another portion. (There are more than one solutions, one just need to draw one of the...
Đọc tiếp
Draw a straight line within the surface of a clock to separate it into 2 portions. Summation of the numbers in one of the portion equal to 2 times the summation of the numbers in another portion. (There are more than one solutions, one just need to draw one of the lines)
(a+b)^2-(a-b)^2