Первое
((3x-y)^2 - (y+3x)^2)÷3
((-2y)×6x)÷3xy
(-12xy)÷3xy
-4xyxy
-4x^2y^2
Второе
((x+2y)^3+(2y-x)^3+4)-3x^2y-2y^3
(x+2y)^3+(2y-x)^3+4-3x^2y-2y^3
x^3+6x^2y+12xy^2+8y^3+8y^3-12xy^2+6x^2y-x^3+4-3x^2y-2y^3
9x^2y+14y^3+4
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Answers & Comments
Первое
((3x-y)^2 - (y+3x)^2)÷3
((-2y)×6x)÷3xy
(-12xy)÷3xy
-4xyxy
-4x^2y^2
Второе
((x+2y)^3+(2y-x)^3+4)-3x^2y-2y^3
(x+2y)^3+(2y-x)^3+4-3x^2y-2y^3
x^3+6x^2y+12xy^2+8y^3+8y^3-12xy^2+6x^2y-x^3+4-3x^2y-2y^3
9x^2y+14y^3+4