Explicación paso a paso:
x^7/x^5
= x^2
6x^3y^2/2y
= 3x^3y^2/y
= 3x^3y
21x^2y^3/7x^2y^2
= 21y^3/7y^2
=3y
9a^2-6a/3a
=3a por (3a-2)/3a
=3a-2
10a^3+8/2
=2(5a^3+4)/2
=5a^3+4
12a^2+8a+24/2
= 2(6a^2+4a+12)/2
=6a^2+4a+12
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Explicación paso a paso:
x^7/x^5
= x^2
6x^3y^2/2y
= 3x^3y^2/y
= 3x^3y
21x^2y^3/7x^2y^2
= 21y^3/7y^2
=3y
9a^2-6a/3a
=3a por (3a-2)/3a
=3a-2
10a^3+8/2
=2(5a^3+4)/2
=5a^3+4
12a^2+8a+24/2
= 2(6a^2+4a+12)/2
=6a^2+4a+12