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= 2m³ - 5n + 30 + 12m² + 10n -12
= 2m³+ 12m² +5n + 18
2. (16pq² + 10pq - 20) - (5pq²-5pq-9)
= 16pq² + 10pq - 10 - 5pq² + 5pq + 9
= 11pq² + 15pq - 1
Semoga Membantu :)
Jika ada yg kurang jelas tanyakan saja ya ^^
Selamat Belajar...