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التكامل بالكسور الجزئية: Mathematics Tawjihi question with answer

A Tawjihi Mathematics question (التكامل) with the answer and worked steps.

From the Tawjihi question bank: Mathematics · التكامل

أجد التكامل: xx16dx\int \frac{\sqrt{x}}{x-16} dx.

التكامل بالكسور الجزئية

The answer

1. نفرض u=xu=\sqrt{x}، إذن x=u2x=u^2 وdx=2ududx=2u\,du. 2. يصبح التكامل 2u2u216du2\int\frac{u^2}{u^2-16}du. 3. بالقسمة: u2u216=1+16u216\frac{u^2}{u^2-16}=1+\frac{16}{u^2-16}. 4. نجزئ 16u216=2u+4+2u4\frac{16}{u^2-16}=-\frac{2}{u+4}+\frac{2}{u-4}. 5. إذن التكامل 2u4lnu+4+4lnu4+C2u-4\ln|u+4|+4\ln|u-4|+C. 6. بالعودة: 2x4lnx+4+4lnx4+C2\sqrt{x}-4\ln|\sqrt{x}+4|+4\ln|\sqrt{x}-4|+C.

Explanation

هذا يدمج التعويض مع القسمة الطويلة والكسور الجزئية؛ لذلك وزنه أعلى في العلامات.

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