Объяснение:
(y+7)³-y³-21y²>0
y³+21y²+147y+343-y³-21y²>0 (Сокращаем y³ и -y³, 21y² и -21y²).
147y+343>0
147y>-343
y>-343/147
y>7/3
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Объяснение:
(y+7)³-y³-21y²>0
y³+21y²+147y+343-y³-21y²>0 (Сокращаем y³ и -y³, 21y² и -21y²).
147y+343>0
147y>-343
y>-343/147
y>7/3