(1) The original formula =-(1/2) * a-(2/3) * the square of b-(1/2) * the square of a+b.

=-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