Jika a = -6, b = -2 dan c = 72, nilai   c      adalah

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                                                   axb

Jika a = -6, b = -2 dan c = 72, nilai   c      adalah

frac{c}{a . b} = frac{72}{(-6).(-2)}
                           = frac{72}{12}
                           = 6

72 per -6 x -2 =  72/12 = 6