Question

tìm đa thức M
a M + (5x^2 - 2xy) = 6x^2 + 9xy - y^2
b (25 x^2y-13xy^2 + y^3)-M= 11 xy^2 - 2y^3

Answer 1

\(a,M+\left(5x^2-2xy\right)=6x^2+9xy-y^2\\ \Rightarrow M=6x^2+9xy-y^2-5x^2+2xy\\ \Rightarrow M=x^2+11xy-y^2\\ b,\left(25x^2y-13xy^2+y^3\right)-M=11xy^2-2y^3\\ \Rightarrow M=25x^2y-13xy^2+y^3-11xy^2+2y^3\\ \Rightarrow M=25x^2y-24xy^2+3y^3\)