1) (а²-1)/(а-5) = (9-1)/(-3-5)=8/-8=-1
2 а) 16b/20b⁴ = 4/5b³
b) (4x-16)/(x²-16) = 4(x-4)/(x+4)(x-4) = 4/(x+4)
в) (12y³-8y²)/(2-3y) = -4y²(2-3y)/(2-3y)=-4y²
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Answers & Comments
1) (а²-1)/(а-5) = (9-1)/(-3-5)=8/-8=-1
2 а) 16b/20b⁴ = 4/5b³
b) (4x-16)/(x²-16) = 4(x-4)/(x+4)(x-4) = 4/(x+4)
в) (12y³-8y²)/(2-3y) = -4y²(2-3y)/(2-3y)=-4y²