1)А+A = (5m)^2 + n + (5m)^2 + n = 25m^2 + 10m + n
А-В = (5m)^2 + n - (-4m)^2 - n = 25m^2 + n + 16m^2 + n = 41m^2
В-В = (-4m)^2 - n - (-4m)^2 - n = 0
А×В = ((5m)^2 + n) ((-4m)^2 - n) = (25m^2 + n) (16m^2 - n) = 400m^4 - 25m^2n + 16m^2n - n^2 = 400m^4 - 9m^2n - n^2
2)А+A = (2x)^2 - 3у)^2 + (2x)^2 - 3у)^2 = 4x^2 - 12xy + 9у^2 + 4x^2 - 12xy + 9у^2 = 8x^2 - 24xy + 18у^2
А-В = (2x)^2 - 3у)^2 - (2x)^2 - 4у)^2 = 4x^2 - 12xy + 9у^2 - 4x^2 + 16xy - 16у^2 = 4xy - 7у^2
В-В = (2x)^2 - 4у)^2 - (2x)^2 - 4у)^2 = 0
А×В = ((2x)^2 - 3у)^2 ((2x)^2 - 4у)^2 = (4x^2 - 12xy + 9у^2) (4x^2 - 16xy + 16у^2) = 16x^4 - 64x^2y + 64xy^2 - 48x^3y + 192xy^2 - 144y^3 = 16x^4 - 48x^3y - 64x^2y + 192xy^2 + 64xy^2 - 144y^3
1)
А+A = (5m)^2 + n + (5m)^2 + n = 25m^2 + 10m + n
А-В = (5m)^2 + n - (-4m)^2 - n = 25m^2 + n + 16m^2 + n = 41m^2
В-В = (-4m)^2 - n - (-4m)^2 - n = 0
А×В = ((5m)^2 + n) ((-4m)^2 - n) = (25m^2 + n) (16m^2 - n) = 400m^4 - 25m^2n + 16m^2n - n^2 = 400m^4 - 9m^2n - n^2
2)
А+A = (2x)^2 - 3у)^2 + (2x)^2 - 3у)^2 = 4x^2 - 12xy + 9у^2 + 4x^2 - 12xy + 9у^2 = 8x^2 - 24xy + 18у^2
А-В = (2x)^2 - 3у)^2 - (2x)^2 - 4у)^2 = 4x^2 - 12xy + 9у^2 - 4x^2 + 16xy - 16у^2 = 4xy - 7у^2
В-В = (2x)^2 - 4у)^2 - (2x)^2 - 4у)^2 = 0
А×В = ((2x)^2 - 3у)^2 ((2x)^2 - 4у)^2 = (4x^2 - 12xy + 9у^2) (4x^2 - 16xy + 16у^2) = 16x^4 - 64x^2y + 64xy^2 - 48x^3y + 192xy^2 - 144y^3 = 16x^4 - 48x^3y - 64x^2y + 192xy^2 + 64xy^2 - 144y^3