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统编教材高中第三册在讲到数学归纳法时有一个直线划分平面问题:“平面上有“条直线。其中任何两条不平行,任何三条不过同一点。证明这n条直线把平面分成f(n)=1/2(n~2+n+2)个部分(见教材P144)”。本来,用数学
Unified textbooks The third volume of high school has a straight line dividing plane problem when it comes to mathematical induction: “There are ”straight lines" in the plane. Any two of them are not parallel and any three are not the same. Prove that these n straight lines divide the plane into f(n)=1/2(n~2+n+2) parts (see textbook P144).” Originally, using mathematics