Question

9/(а-а^2)-9/а при а=6

Answer 1

(9-9+9а)/а(1-а)=9а/(а(1-а)) теперь  на место а поставим 6    9*6/(6(1-6)=54/-30=9/-5

Answer 2

To evaluate the expression:

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9/(a - a^2) - 9/a

when a = 6, we substitute 6 for a:

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9/(6 - 6^2) - 9/6

Simplifying the denominator in the first term:

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9/(-30) - 9/6

Simplifying the second term:

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9/(-30) - 3/2

Finding a common denominator:

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9/(-30) - 45/30

Combining the fractions:

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-36/30

Reducing the fraction:

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-6/5

Therefore, 9/(a - a^2) - 9/a evaluated at a = 6 is -6/5.