bậc các đa thức trên là 3
b/
A+D=(1/2x^2 y) + (1/5x^2 y)
=1/2x^2 y + 1/5x^2 y
= 7/10 x^2 y
A+E =(1/2x^2 y) + (2/5x^2 y)
=1/2x^2 y + 2/5x^2 y
= 9/10 x^2 y
A+H=(1/2x^2 y) + (5/6x^2 y)
=1/2x^2 y + 5/6x^2 y
= 4/3 x^2 y
D+E=(1/5x^2 y) + (2/5x^2 y)
=1/5x^2 y + 2/5x^2 y
= 3/5 x^2 y
D+H=(1/5x^2 y) + (5/6x^2 y)
=1/5x^2 y + 5/6x^2 y
= 31/30 x^2 y
E+H=(2/5x^2 y) + (5/6x^2 y)
=2/5x^2 y + 5/6x^2 y
= 37/30 x^2 y
B-C=(3/5 xy^2)-(1/4xy^2)
=3/5 xy^2-1/4xy^2
=7/20xy^2
B-F=(3/5 xy^2)-(1/6xy^2)
=3/5 xy^2-1/6xy^2
=13/30xy^2
B-G=(3/5 xy^2)-(3/4xy^2)
=3/5 xy^2-3/4xy^2
=-3/20xy^2
C-F=(1/4 xy^2)-(1/6xy^2)
=1/4 xy^2-1/6xy^2
=1/12xy^2
C+G=(1/4 xy^2)+(4/4xy^2)
=1/4 xy^2+3/4xy^2
=xy^2
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