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1) - 3/5 a^2 - 6/5 ab -3/5b^2
2) 2a(b-5)-3b+15
3)y^3-4y^2-y+4
1) - 3/5 a^2 - 6/5 ab -3/5b^2
2) 2a(b-5)-3b+15
3)y^3-4y^2-y+4
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2)2ab-10a-3b+15
3)y²(y-4)-(y-4)=(y-4)(y²-1)=(y-4)(y-1)(y+1)