Jawabanmu

Jawaban paling cerdas!
2014-09-03T17:40:31+07:00
1. menyamakan penyebutnya.
 \frac{3}{x+1} + \frac{3}{x-1} = \frac{3(x-1)}{(x+1)(x-1)} + \frac{3(x+1)}{(x+1)(x-1)}
= \frac{3x-3+3x+3}{(x+1)(x-1)}
= \frac{6x}{ x^{2} +1}

2. memfaktorkan
 \frac{ 3x^{2}-27 }{ x^{2} +2x-3} = \frac{3( x^{2}-9)}{(x+3)(x-1)} = \frac{ 3(x^{2} - 3^{2}) }{(x+3)(x-1)}

= \frac{3(x+3)(x-3)}{(x+3)(x-1)} = \frac{3(x-3)}{x-1}= \frac{3x-9}{x-1}


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