Ответ:
-7m²×(-m²)-7m²×3n²-8n²×(m²)-8n²×3n²=7m⁴-21m²n²+8m²n²-24n⁴=7m⁴-13m²n²-24n⁴
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Ответ:
-7m²×(-m²)-7m²×3n²-8n²×(m²)-8n²×3n²=7m⁴-21m²n²+8m²n²-24n⁴=7m⁴-13m²n²-24n⁴