1)A=x^6+y^5+x^4y+1-x^4y^4 2)B=7x^5-2x^4+3x^2-1+(-7x^5)-2

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1) \( A = x^6 + y^5 + x^4 y + 1 - x^4 y^4 \)

2) \( B = 7 x^5 - 2 x^4 + 3 x^2 - 1 + (-7 x^5) - 2 \)