Question

Tim a biet:

a,(25x^2y-13xy^2+y^3)-A=11x^2y-2y^3

b,(12x^4-15x^2y+2xy^2+7)+A=0

Answer 1

\(\left(25x^2y-13xy^2+y^3\right)-A=11x^2y-2y^3.\)

\(\Rightarrow A=\left(25x^2y-13xy^2+y^3\right)-\left(11x^2y-2y^3\right)\)

\(\Leftrightarrow A=25x^2y-13xy^2+y^2-11x^2y+2y^3\)

\(\Leftrightarrow A=\left(25x^2y-11x^2y\right)-13xy^2+y^2+2y^3\)

\(\Leftrightarrow A=14x^2y-13xy^2+y^2+2y^3\)