Question

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Answer 1

preg1

5xy^2-3y^2x-xy-4xy^2+2x^2y+3xy

agrupando terminos

5xy^2-3xy^2-4xy^2-xy+3xy+2x^2y

-2xy^2+2x^2y+2xy rpta a

preg2

(a^2b-a)(a+bc)+(a-c^2)a^2b

efectuando

a^3b+a^2bc-a^2-abc+a^3b-a^2bc^2

reduciendo

2a^3b+a^2bc-a^2bc^2-abc-a^2

rpta b