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interpolation
- 定理1(介值定理)设函数f(x)在区间[a,b]连续,且f(a)f(b)<0,则方程f(x)=0在区间[a,b]内至少有一个根。(Theorem 1 (intermediate value theorem) set the function f (x) in the interval [a, b] continuous, and f (a) f (b) <0, then the equation f (x) =0 is at least one root in the interva