Ответ:
Объяснение:
1) ... = 3х+3+х+1 = 4х+4
2) ... = а-2-2а+4 = 2-а
3) ... = 3х^2 - 6x - 5x^2 - 15x = -2x^2 - 21x
4) ... = 2xy - 2y^2 + 3y^2 - 2xy = y^2
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Ответ:
Объяснение:
1) ... = 3х+3+х+1 = 4х+4
2) ... = а-2-2а+4 = 2-а
3) ... = 3х^2 - 6x - 5x^2 - 15x = -2x^2 - 21x
4) ... = 2xy - 2y^2 + 3y^2 - 2xy = y^2