Ответ:
* = 4m⁴-15m²n+n²
Объяснение:
(7m⁴-9m²n+n²)-(*)=3m⁴+6m²n
7m⁴-9m²n+n²-4m⁴+15m²n-n²=3m⁴+6m²n
3m⁴+6m²n=3m⁴+6m²n
Ч.Т.Д.
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Ответ:
* = 4m⁴-15m²n+n²
Объяснение:
(7m⁴-9m²n+n²)-(*)=3m⁴+6m²n
* = 4m⁴-15m²n+n²
7m⁴-9m²n+n²-4m⁴+15m²n-n²=3m⁴+6m²n
3m⁴+6m²n=3m⁴+6m²n
Ч.Т.Д.