October 2019 1 11 Report
Pelajaran matematika kelas 9 tentang persamaan kuadrat
Tentukan akar akarnya
1) x² + 9x + 20 = 0
2) x² + 10x + 21 = 0
3) x² + 17x + 72 = 0
4) x² + 17x + 30 = 0​

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