(X^+Y^+1)*(X^+Y^-3)==12(X^+Y^)^-2(X^+Y^)-3==12(X^+Y^)^-2(X^+Y^)-15==0(X^+Y^+3)*(X^+Y^-5)==o1.X^+Y^=-3;2.X^+Y^=5
等于5