5x^2-6y^3+1/3 a^2
x^2-4
m
x^3+x^2-x
x^2y^3
5yz
3a
x-y
x^2-5x+6
-11xy
a+b
x^2+2/5 x +1/25
a^3+a^2-ab^3
ab^2
r-59
a^2+6a+9
6xy^4
9x^3+1
-6b
a+b+c
3.5m^2n
x^2+10x+25
10x^2
-8m^2n^5
