Question

SÓ A LETRA ----> B)...

Answer 1

$\ \ \ (-5xy)\cdot(-y)^2+(-3y)^3\cdot(-2x)\\ \\=(-5xy)\cdot y^2+(-27y^3)\cdot(-2x)\\ \\=-5xy^3+(+54xy^3)\\ \\=-5xy^3+ 54xy^3\\ \\=49xy^3$