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1) -3/5a^2 - 6/5ab - 3/5 b^2
2) 2a(b-5)-3b+15
3) y^3-4y^2-y+4
1) -3/5a^2 - 6/5ab - 3/5 b^2
2) 2a(b-5)-3b+15
3) y^3-4y^2-y+4
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2) = 2a(b-5)-3(b-5) = (b-5)(2a-3)
3) = y²(у-4)-(у-4) = (у-4)(у²-1) = (у-4)(у-1)(у+1)