wyrazenia algebraiczne...zgóry dzieki :)
3*(2x²-4yx)-(x+2y)*(-3x-y)=...
3*(2x² - 4yx) - (x + 2y)*(-3x - y)= 6x² - 12xy - (-3x² - xy - 6xy - 2y²) =
6x² - 12xy + 3x² + xy + 6xy + 2y² = 9x² - 5xy + 2y²
3*(2x²-4yx)-(x+2y)*(-3x-y)== 6x^{2}-12yx-(-3x^{2}-yx-6yx-2y^{2}) == 6x^{2}-12yx+3x^{2}+yx+6yx+2y^{2} == 9x^{2}+2y^{2}-5yxten "yx" mozesz zamienic miejscami na "xy":)
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3*(2x² - 4yx) - (x + 2y)*(-3x - y)= 6x² - 12xy - (-3x² - xy - 6xy - 2y²) =
6x² - 12xy + 3x² + xy + 6xy + 2y² = 9x² - 5xy + 2y²
3*(2x²-4yx)-(x+2y)*(-3x-y)=
= 6x^{2}-12yx-(-3x^{2}-yx-6yx-2y^{2}) =
= 6x^{2}-12yx+3x^{2}+yx+6yx+2y^{2} =
= 9x^{2}+2y^{2}-5yx
ten "yx" mozesz zamienic miejscami na "xy"
:)