378
Объяснение:
x^4*y^2+x^2*y^4 = x^2*y^2(x^2 + y^2) = x^2*y^2(x^2 + y^2 + 2xy - 2xy) =
= x^2*y^2((x^2 + y^2 + 2xy) - 2xy) = x^2*y^2((x+ y)^2 - 2xy) =
= (xy)^2((x+ y)^2 - 2xy) = (-3)^2( 6^2 - 2*(-3)) = 9*(36 + 6) = 9*42 = 378
378
Объяснение:
x^4*y^2+x^2*y^4 = x^2*y^2(x^2 + y^2) = x^2*y^2(x^2 + y^2 + 2xy - 2xy) =
= x^2*y^2((x^2 + y^2 + 2xy) - 2xy) = x^2*y^2((x+ y)^2 - 2xy) =
= (xy)^2((x+ y)^2 - 2xy) = (-3)^2( 6^2 - 2*(-3)) = 9*(36 + 6) = 9*42 = 378