3/12+2/4=
3*3-3/3+3
4/6-1/3=
x= $\sqrt{\Box}$ 4x $^{2}$ -5x+50-x
4/5+9/10=
4/5+9/10+
2.27.$10^{-6}$.45000
√(x+c)^2+y^2+√(x-c)^2+y^2=29
2/5+1/10=
3/9+1/3=