恶魔少董傀儡新娘:x-y=1,x^2-y^2+3x-5y的值

x-y=1,x^2-y^2+3x-5y的值 方程组{5（x-y)=3(x+y)-2 (1) (x+y)*2=3(x-y)-4 求x和y的值 (x-y)^2×(y-x)^3=??? 已知(X +2x+3)(3y +2y+1)= ,求x+y的值？ 已知X+Y=-4，求1/2（X+Y)+4(X-Y)-3(X-Y)-3/2(X+Y)-X+Y 1/4(x+y)+1/2(x+y)*(x+y)>=x*根号y+y*根号x 求(2x-3y+z)-3{x-2[-z+(x-y)]-(3y-5x)}+1的结果是多少？ （x-y)^3*(x-y)^2*(y-x) 3X(X-Y)+2Y(X-Y) 已知x*x+y*y-2x+4y+5=0求x和y的值