①2/3a2+3/4b-5/6ab②1/﹙x+y﹚-1/﹙x-y﹚+2x/﹙x2-y2﹚
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①
2/3a²＋3/4b－5/6ab
=(8b+9a²-10a)/12a²b
②
1/(x+y)-1/(x-y)+2x/(x²-y²)
=[(x-y)-(x+y)+2x]/(x²-y²)
=2(x-y)/(x+y)(x-y)
=2/(x+y)
2/3a²＋3/4b－5/6ab
=(8b+9a²-10a)/12a²b
②
1/(x+y)-1/(x-y)+2x/(x²-y²)
=[(x-y)-(x+y)+2x]/(x²-y²)
=2(x-y)/(x+y)(x-y)
=2/(x+y)
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