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19. 4 akar 20 - 3 akar 45 - 2 akar 80 + akar 245 = 8 akar 5 - 9 akar 5 - 8 akar 5 + 7 akar 5 = -2 akar 5 (A)
Saya menambahkan yg belum djwb atas saya. Thx