Ответ:
(15-x)²>x(x-12)+9
225-30x+x²>x²-12x+9
-30x+x²-x²+12x>9-225
-18x>-216
x<12
(-○○,12)
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Ответ:
(15-x)²>x(x-12)+9
225-30x+x²>x²-12x+9
-30x+x²-x²+12x>9-225
-18x>-216
x<12
(-○○,12)