a^2+6a+9
45.5m^2n+23.22m^3n^2
a+b
-8m^2n^5
x^2-5x+6
x^2y^3
-9xy
5yz
10x^2
-5b
3.5m^2n
x^2-4
x^2+10x+25
r-5
a^3+a^2-ab^3
9x^2+1
x-y
3a
x^2+2/5 x+1/25
x^3+x^2-x
6xy^4
ab^2
5x^2-6y^3+1/3 a^2
a+b+c
