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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: 3x2+2x32x2+xdx\int \frac{3x^2 + 2}{x^3 - 2x^2 + x} dx.

التكامل بالكسور الجزئية

The answer

1. نحلل المقام: x32x2+x=x(x1)2x^3-2x^2+x=x(x-1)^2. 2. الصورة الجزئية: Ax+Bx1+C(x1)2\frac{A}{x}+\frac{B}{x-1}+\frac{C}{(x-1)^2}. 3. بعد الضرب: 3x2+2=A(x1)2+Bx(x1)+Cx3x^2+2=A(x-1)^2+Bx(x-1)+Cx. 4. بالتعويض: x=0A=2x=0 \Rightarrow A=2، وx=1C=5x=1 \Rightarrow C=5، ثم مثلاً x=1B=1x=-1 \Rightarrow B=1. 5. التكامل 2lnx+lnx15x1+C2\ln|x|+\ln|x-1|-\frac{5}{x-1}+C.

Explanation

مثال العامل الخطي المكرر؛ الخطأ الشائع هو كتابة كسر واحد فقط للعامل (x1)2(x-1)^2.

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