已知|x-y-3|+(2x+2y+10)²=0所以已知|x-y-3|=0,(2x+2y+10)²=0从而x-y-3=0,2x+2y+10=0即x-y=3,x+y=-5所以(x+y)(x-y)=-5*3=-15
∵|x-y-3|+(2x+2y+10)²=0∴x-y-3=0;(1)2x+2y+10=0;(2)解得:x=-1.y=-4;(x+y)(x-y)=x²-y²=1-16=-15;
-5*3=-15
*9*98*85