Ответ:
1)...=15b²-12bc-10bc+8c²=15b²-22bc+8c²
2)...=8b²-24bc+5bc-15c²=8b²-19bc-15c²
3)...=12а⁴+10a²b²-24a²b²-20b⁴=12a⁴-14a²b²-20b⁴
Объяснение:
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Ответ:
1)...=15b²-12bc-10bc+8c²=15b²-22bc+8c²
2)...=8b²-24bc+5bc-15c²=8b²-19bc-15c²
3)...=12а⁴+10a²b²-24a²b²-20b⁴=12a⁴-14a²b²-20b⁴
Объяснение: