(x+3y)/﹙x²-y²﹚-(x+2y)/(x²-y²)+﹙2x-3y﹚/﹙x²-Y²﹚
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(x+3y)/﹙x²-y²﹚-(x+2y)/(x²-y²)+﹙2x-3y﹚/﹙x²-Y²﹚(x+3y)/﹙x²-y²﹚-
(x+3y)/﹙x²-y²﹚-(x+2y)/(x²-y²)+﹙2x-3y﹚/﹙x²-Y²﹚
(x+3y)/﹙x²-y²﹚-(x+2y)/(x²-y²)+﹙2x-3y﹚/﹙x²-Y²﹚
(x+3y)/﹙x²-y²﹚-(x+2y)/(x²-y²)+﹙2x-3y﹚/﹙x²-Y²﹚
原式=y/﹙x²-y²﹚+﹙2x-3y﹚/﹙x²-Y²﹚=2﹙x-y﹚/﹙x²-Y²﹚=2/(x+y)