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初数圆中与直角三角形，无切点求切线以及利用等面积法求线段长
圆中三大切线定理要熟知切线的性质判定定理，包括切线的证明（有切点和无切点的证法）；切线长定理；切割线定理（难点）
初三数学全学年各章节重点，难点及考点题型讲解40/85
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