Tính chia: a, (6 $x^{5}$ $y^{2}$ -9 $x^{4}$ $y^{3}$ +15 $x^{3}$ $y^{4}$ ): 3 $x^{3}$ $y^{2}$ b, (2 $x^{3}$ -21 $x^{2}$ +67x-60): (x-5) c, ( $x^{4}$ +2 $x^{3}$ +x-25): ( $x^{2}$ +5) d, (6 $x^{3}$ -7 $x^{2}$ -x+2): (2x+1)

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