If you mean 2 plus 2 equals 5 it is possible.
2 plus 2 equals 22 (or it could also be 4 if you want it but must be 22 to make 5...it makes sense)
V is the 22nd letter in the alphabet and the roman numeral for V is 5.
BOOM!
2 PLUS 2 EQUALS 5!
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(1/2) / (2/25) = (1/2) * (25/2) = 25(1/2) / (2/25) = (1/2) * (25/2) = 25(1/2) / (2/25) = (1/2) * (25/2) = 25(1/2) / (2/25) = (1/2) * (25/2) = 25
4.56 = 456/100 = 114/25 or 414/25
2:25
x/y = 5/(y^2) and y/x = 5/(x^2). So x/y + y/x = 5/(y^2) + 5/(x^2), which equals 5x^2/(x^2 y^2) + 5y^2/(x^2 y^2) equals 5(x^2 + y^2)/25 equals (x^2 + y^2)/5. x^2 = 25/y^2, so you get (25/y^2 + y^4/y^2)/5 equals ((25 + y^4)/y^2)/25, which shows that your math teacher is on crack. Seriously, I'm not sure that's true.
2.25 = 2 25/100 = 2 (25÷25)/(100÷25) = 2 1/4