x、y互为相反数,则x+y=0①
(x+3)的2次方-(y+3)的2次方=4
则(x+3+y+3)(x+3-y-3)=4
则(x+y+6)(x-y)=4
则(0+6)(x-y)=4
所以x-y=2/3②
①+②,的2x=2/3,解得x=1/3
代入①,解得y=-1/3
x、y互为相反数,则x+y=0①
(x+3)的2次方-(y+3)的2次方=4
则(x+3+y+3)(x+3-y-3)=4
则(x+y+6)(x-y)=4
则(0+6)(x-y)=4
所以x-y=2/3②
①+②,的2x=2/3,解得x=1/3
代入①,解得y=-1/3