7a^3-6a^3b+3a^2b+3a^3+6a^3b-3a^2b-10a^3+3 =(7a^3+3a^3-10a^3)+(-6a^3b+6a^3b)+(3a^2b-3a^2b)+3 =0+0+0+3 =3 所以a和b的值是多余的