Toán Lớp 8: 4x+5/2x^3y-5-6x/2x^3y=a/x^2y.Giá trị của a là
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Toán Lớp 8: 4x+5/2x^3y-5-6x/2x^3y=a/x^2y.Giá trị của a là
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\dfrac{{4x + 5}}{{2{x^3}y}} – \dfrac{{5 – 6x}}{{2{x^3}y}} = \dfrac{A}{{{x^2}y}}\\
\Leftrightarrow \dfrac{{4x + 5 – 5 + 6x}}{{2{x^3}y}} = \dfrac{A}{{{x^2}y}}\\
\Leftrightarrow \dfrac{{10x}}{{2{x^3}y}} = \dfrac{A}{{{x^2}y}}\\
\Leftrightarrow \dfrac{5}{{{x^2}y}} = \dfrac{A}{{{x^2}y}}\\
\Leftrightarrow A = 5\\
Vậy\,A = 5
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