x=2.
x、y互为相反数,则x+y=0 ①
(x+y+3)(x-y-2)=6
(0+3)(x-y-2)=6
3(x-y-2)=6
x-y-2=2
x-y=4
由①,得x=-y
则-y-y=4,则y=-2
则x=-y=2
x、y互为相反数,则x+y=0
(x+y+3)(x-y-2)=6,
3(x-y-2)=6
x-y-2=2
x-y=4
因为x+y=0
两式相加,得2x=4
则x=2
∵x、y互为相反数,∴x+y=0 ①
(x+y+3)(x-y-2)=6 3(x-y-2)=6 x-y-2=2 x-y=4 ②
①+②:2x=4 ∴x=2