=-2 * the square of a+(1/3) b
(2) The original formula = 4 * x-3 * y+3 * y-x-x+y-5 * x.
=-3*x+y
(3) The original formula =5*x square *y- 15*x*y square -2*x square *y+ 14*x*y square.
=3*x squared y-x*y squared
(4) The original formula =3*m square -5*m+( 1/2)*m-3-2*m square +4.
= the square of m -(9/2)*m+4