Thu gọn các đa thức sau: 1) A=4y^2+5x^3y^3−(2y^2+5x^3y^3−16). 2) B=(x−5)(x+5)+(x−5)^2−2x^2.

1) \(A = 4{y^2} + 5{x^3}{y^3} - \left( {2{y^2} + 5{x^3}{y^3} - 16} \right)\)

\(A = 4{y^2} + 5{x^3}{y^3} - 2{y^2} - 5{x^3}{y^3} + 16\)

\(A = \left( {4{y^2} - 2{y^2}} \right) + \left( {5{x^3}{y^3} - 5{x^3}{y^3}} \right) + 16\)

\(A = 2{y^2} + 16\).

2) \(B = \left( {x - 5} \right)\left( {x + 5} \right) + {\left( {x - 5} \right)^2} - 2{x^2}\)

\(B = {x^2} - 25 + {x^2} - 10x + 25 - 2{x^2}\)

\(B = \left( {{x^2} + {x^2} - 2{x^2}} \right) - 10x + \left( {25 - 25} \right)\)

\(B = - 10x\).