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11) (2/5)x^2 – xy/2 +
2xy/5 – (y^2)/2 è
2/5x^2 –xy/10 – (y^2)/2
12) 4/3x^3 – 2/3(x^2) – 10/3(x^2) + 5x/3 ==> 4/3x^3 – 4(x^2) + 5x/3
13) x^2y-2x^2+3/2(xy) – (2/3)xy^2+(4/3)xy – y^2 ==> yx^2-2x^2 – (2/3)xy^2+(17/6)xy – y^2
14) 6x^2 – 4x + 9x – 6 ==> 6x^2 + 5x – 6
15) 6x^4 – 9x^2 – 10x^2 – 6 ==> 6x^4 – 19x^2 – 6
16) x^4 + 2x^3 – x^2 – x^3 – 2x^2 + x ==> x^4 + x^3 – 3x^2 + x
17) x^3 + 5x^2 + 6x + x^2 + 5x + 1==> x^3 + 6x^2 + 11x + 1
12) 4/3x^3 – 2/3(x^2) – 10/3(x^2) + 5x/3 ==> 4/3x^3 – 4(x^2) + 5x/3
13) x^2y-2x^2+3/2(xy) – (2/3)xy^2+(4/3)xy – y^2 ==> yx^2-2x^2 – (2/3)xy^2+(17/6)xy – y^2
14) 6x^2 – 4x + 9x – 6 ==> 6x^2 + 5x – 6
15) 6x^4 – 9x^2 – 10x^2 – 6 ==> 6x^4 – 19x^2 – 6
16) x^4 + 2x^3 – x^2 – x^3 – 2x^2 + x ==> x^4 + x^3 – 3x^2 + x
17) x^3 + 5x^2 + 6x + x^2 + 5x + 1==> x^3 + 6x^2 + 11x + 1
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