1.函数f(x)是(+∞,-∞)上的增函数,若对于x1,x2∈R都有f(x1)+f(x2)≥f(﹣x1)+f(﹣x2)成立,则必有( ) ………………A.x1≥x2 B.x1≤x2 C.x1+x2≥0 D.x1+x2≤02.若圆C1:x²+y²-2mx+m²-4=0与园C2:x²
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