当x=-2时.(x+x2-5)-(x2-x-1)等于

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当x=-2时.(x+x2-5)-(x2-x-1)等于当x=-2时.(x+x2-5)-(x2-x-1)等于当x=-2时.(x+x2-5)-(x2-x-1)等于(x+x2-5)-(x2-x-1)=x+x2

当x=-2时.(x+x2-5)-(x2-x-1)等于
当x=-2时.(x+x2-5)-(x2-x-1)等于

当x=-2时.(x+x2-5)-(x2-x-1)等于
(x+x2-5)-(x2-x-1)
=x+x2-5-x2+x+1
=2x-4
=2×(-2)-4
=-8