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