1) 2y²-y-7+y²+3y+12
2) 12a-3b-4c+5d-8a-7b-+15c-3d
3) 7a⁴+12a³b+3a²b²-7ab³+5a⁴-9a³b-3a²b²-ab3
2) 12a-3b-4c+5d-8a-7b-+15c-3d
3) 7a⁴+12a³b+3a²b²-7ab³+5a⁴-9a³b-3a²b²-ab3
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Ответ:
Объяснение:
1) 2y²-y-7+y²+3y+12=у^2+2у+5
2) 12a-3b-4c+5d-8a-7b-+15c-3d=
4а-10b+11c+2d
3) 7a⁴+12a³b+3a²b²-7ab³+5a⁴-9a³b-3a²b²-ab³=12a^4+3a^3b-8ab^3