х²-(9-х) ²>-2х
х²-(81-18х+х²)>-2х
х²-81+18х-х²>-2х
-81+18х>-2х
18х+2х>81
20х>81
х>81/20=4 1/20 (или 4,05)
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х²-(9-х) ²>-2х
х²-(81-18х+х²)>-2х
х²-81+18х-х²>-2х
-81+18х>-2х
18х+2х>81
20х>81
х>81/20=4 1/20 (или 4,05)