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menggunakan cara sarrus
3 0 6 3 0
1 4 7 1 4
2 5 9 2 5
3x4x9 + 0x7x2 + 6x1x5 - 0x1x9 + 3x7x5 + 6x4x2
=108 + 0 + 30 - 0 + 105 + 48
= 138-153 = -15
yang ke 2 lanjutin aja, caranya sama kok...
inversnya saya lupa caranya... :)