Ответ:
а)(2х+3)+(3х-9)
2х+3х=-9-3
6х=-12
х=-2
б)(2х²+6х+2(+(х²+х-2)
(2х²+8х-2)
2(х²+4х-1)
в)(2х³+6х-2)+(х³-1)
2х³+6х-2+х³-1
3(х³+2х-1)
г)(а³+5а²-10)+(а³-17)
(а³+5а²+а³)+(-10+(-17))
7а⁸+(-27)
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Ответ:
а)(2х+3)+(3х-9)
2х+3х=-9-3
6х=-12
х=-2
б)(2х²+6х+2(+(х²+х-2)
(2х²+8х-2)
2(х²+4х-1)
в)(2х³+6х-2)+(х³-1)
2х³+6х-2+х³-1
3(х³+2х-1)
г)(а³+5а²-10)+(а³-17)
(а³+5а²+а³)+(-10+(-17))
7а⁸+(-27)